diff --git a/package.json b/package.json
index 4d1d027..4e46a26 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "bin": "built/mongodb-download-cli.js",
   "types": "built/mongodb-download.d.ts",
   "scripts": {
+    "build": "tsc",
     "test": "mocha"
   },
   "repository": {
@@ -22,6 +23,7 @@
     "url": "https://github.com/winfinit/mongodb-download/issues"
   },
   "dependencies": {
+    "semver": "^5.6.0",
     "yargs": "^3.26.0",
     "debug": "^2.2.0",
     "getos": "^2.7.0",
@@ -34,7 +36,9 @@
   "devDependencies": {
     "@types/node": "^6.0.70",
     "chai": "^3.5.0",
-    "mocha": "^3.2.0"
+    "mocha": "^3.2.0",
+    "rewire": "^4.0.1",
+    "typescript": "^3.1.3"
   },
   "homepage": "https://github.com/winfinit/mongodb-download#readme"
 }
diff --git a/src/mongodb-download.ts b/src/mongodb-download.ts
index 975a033..988a52b 100644
--- a/src/mongodb-download.ts
+++ b/src/mongodb-download.ts
@@ -5,11 +5,12 @@ const path: any = require('path');
 const Debug: any = require('debug');
 const getos: any = require('getos');
 const url: any = require('url');
+const semver: any = require('semver');
 const decompress: any = require('decompress');
 const request: any = require('request-promise');
 const md5File: any = require('md5-file');
 
-const DOWNLOAD_URI: string = "https://downloads.mongodb.org";
+const DOWNLOAD_URI: string = "https://fastdl.mongodb.org";
 const MONGODB_VERSION: string = "latest";
 
 export interface IMongoDBDownloadOptions {
@@ -273,7 +274,7 @@ export class MongoDBDownload {
       this.getDownloadURIMD5().then((md5URL) => {
         request(md5URL).then((signatureContent: string) => {
           this.debug(`getDownloadMD5Hash content: ${signatureContent}`);
-          let signatureMatch: string[] = signatureContent.match(/(.*?)\s/);
+          let signatureMatch: string[] = signatureContent.match(/([^\s]*)(\s*|$)/);
           let signature: string = signatureMatch[1];
           this.debug(`getDownloadMD5Hash extracted signature: ${signature}`);
           this.cacheMD5Hash(signature).then(() => {
@@ -426,10 +427,26 @@ export class MongoDBDownload {
 
   getArchiveName(): Promise<string> {
     return new Promise<string>((resolve, reject) => {
-      //var name = "mongodb-" + mongo_platform + "-" + mongo_arch;
-      let name = "mongodb-" +
-      this.mongoDBPlatform.getPlatform() + "-" +
-      this.mongoDBPlatform.getArch();
+      let platform: string = this.mongoDBPlatform.getPlatform();
+      let arch: string = this.mongoDBPlatform.getArch();
+      let version: string = this.getVersion();
+
+      switch (platform) {
+        case 'osx':
+          if ((version === 'latest') || semver.satisfies(version, '>=3.5')) {
+             platform = `${platform}-ssl`;
+          }
+          break;
+        case 'win32':
+          // TODO: '2012plus' for 4.x and above
+          if ((version === 'latest') || semver.satisfies(version, '>=3.5')) {
+             arch = `${arch}-2008plus-ssl`;
+          }
+          break;
+        default:
+          break;
+      }
+      let name: string = `mongodb-${platform}-${arch}`;
 
       this.mongoDBPlatform.getOSVersionString().then(osString => {
         osString && (name += `-${osString}`);
@@ -506,6 +523,7 @@ export class MongoDBPlatform {
         } else if (/debian/i.test(os.dist)) {
           resolve(this.getDebianVersionString(os));
         } else {
+          // TODO: 'legacy', 'static'
           reject("");
         }
       });
@@ -551,6 +569,7 @@ export class MongoDBPlatform {
     } else if (/^5/.test(os.release)) {
       name += "55";
     } else {
+      // TODO: 'rhel57'
       this.debug("using legacy release");
     }
     return name;
diff --git a/test/MongoDBDownloadLocationTest.js b/test/MongoDBDownloadLocationTest.js
new file mode 100644
index 0000000..674eb4f
--- /dev/null
+++ b/test/MongoDBDownloadLocationTest.js
@@ -0,0 +1,703 @@
+const expect = require('chai').expect;
+const assert = require('assert');
+const rewire = require('rewire');
+const url = require('url');
+const request = require('request-promise');
+const libUnderTest = rewire('../built/mongodb-download.js');
+const {MongoDBDownload} = libUnderTest;
+
+
+// variation options
+//   { platform, version, os }
+//   plus ...
+//   `location` = expected Download URL
+//   `isMissing` = assert no such download
+//   `only` = explicit inclusion, like `it.only`
+//
+// `platform` derived from MongoDBPlatform#translatePlatform, #translateArch
+//   'darwin'; x64
+//   'win32'; x64
+//   'linux';
+//     + `os` variants:  'ubuntu', etc.
+//     + arch: 'x64' (x86_64), 'ia32' (i386, i686), unsupported: arm64, aarch64, s390x
+//   'elementary OS' => 'linux'
+//   'sunos'; x64
+//
+// `version` derived from MongoDBPlatform#getOSVersionString
+//   @see Community Server versions
+//   https://www.mongodb.com/download-center
+const VARIATIONS = [
+
+    // latest
+    {
+        platform: 'darwin',
+        version: 'latest',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-ssl-x86_64-latest.tgz',
+    },
+    {
+        platform: 'win32',
+        version: 'latest',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2008plus-ssl-latest.zip',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-latest.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: 'latest',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-latest.tgz',
+    },
+    {
+        platform: 'sunos',
+        version: 'latest',
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-latest.tgz',
+    },
+
+
+    // version: '4.0.3',
+    {
+        platform: 'darwin',
+        version: '4.0.3',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-ssl-x86_64-4.0.3.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '4.0.3',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2008plus-ssl-4.0.3.zip',
+    },
+    {
+        platform: 'linux',
+        version: '4.0.3',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-4.0.3.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: '4.0.3',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-4.0.3.tgz',
+    },
+
+    {
+        platform: 'sunos',
+        version: '4.0.1', // unsupported
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-4.0.1.tgz',
+        isMissing: true,
+    },
+
+    // version: '3.6.8',
+    {
+        platform: 'darwin',
+        version: '3.6.8',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-ssl-x86_64-3.6.8.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '3.6.8',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2008plus-ssl-3.6.8.zip',
+    },
+    {
+        platform: 'linux',
+        version: '3.6.8',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.6.8.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: '3.6.8',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.6.8.tgz',
+    },
+
+    {
+        platform: 'sunos',
+        version: '3.6.1', // unsupported
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-3.6.1.tgz',
+        isMissing: true,
+    },
+
+    {
+        platform: 'darwin',
+        version: '3.5.1',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-ssl-x86_64-3.5.1.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '3.5.1',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2008plus-ssl-3.5.1.zip',
+    },
+
+    // version: '3.4.17',
+    {
+        platform: 'darwin',
+        version: '3.4.17',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-x86_64-3.4.17.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '3.4.17',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-3.4.17.zip',
+    },
+    {
+        platform: 'linux',
+        version: '3.4.17',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.4.17.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: '3.4.17',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.4.17.tgz',
+    },
+    {
+        platform: 'sunos',
+        version: '3.4.5', // never reached 3.4.17
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-3.4.5.tgz',
+    },
+
+    {
+        platform: 'sunos',
+        version: '3.4.6', // unsupported
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-3.4.6.tgz',
+        isMissing: true,
+    },
+
+    // version: '3.2.21',
+    {
+        platform: 'darwin',
+        version: '3.2.21',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-x86_64-3.2.21.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '3.2.21',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-3.2.21.zip',
+    },
+    {
+        platform: 'linux',
+        version: '3.2.21',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.2.21.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: '3.2.21',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.2.21.tgz',
+    },
+    {
+        platform: 'sunos',
+        version: '3.2.14', // never reached 3.2.21
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-3.2.14.tgz',
+    },
+
+    {
+        platform: 'sunos',
+        version: '3.2.21',
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-3.2.21.tgz',
+        isMissing: true,
+    },
+
+    // version: '3.0.15',
+    {
+        platform: 'darwin',
+        version: '3.0.15',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-x86_64-3.0.15.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '3.0.15',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-3.0.15.zip',
+    },
+    {
+        platform: 'linux',
+        version: '3.0.15',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.0.15.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: '3.0.15',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.0.15.tgz',
+    },
+    {
+        platform: 'sunos',
+        version: '3.0.15',
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-3.0.15.tgz',
+    },
+
+    // version: '2.6.10',
+    {
+        platform: 'darwin',
+        version: '2.6.10',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-x86_64-2.6.10.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '2.6.10',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2.6.10.zip',
+    },
+    {
+        platform: 'linux',
+        version: '2.6.10',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.6.10.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: '2.6.10',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.6.10.tgz',
+    },
+    {
+        platform: 'sunos',
+        version: '2.6.10',
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-2.6.10.tgz',
+    },
+
+    // version: '2.4.13',
+    {
+        platform: 'darwin',
+        version: '2.4.13',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-x86_64-2.4.13.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '2.4.13',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2.4.13.zip',
+    },
+    {
+        platform: 'linux',
+        version: '2.4.13',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.13.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: '2.4.13',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.13.tgz',
+    },
+    {
+        platform: 'sunos',
+        version: '2.4.13',
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-2.4.13.tgz',
+    },
+
+    // version: '2.2.7',
+    {
+        platform: 'darwin',
+        version: '2.2.7',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-x86_64-2.2.7.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '2.2.7',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2.2.7.zip',
+    },
+    {
+        platform: 'linux',
+        version: '2.2.7',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.2.7.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: '2.2.7',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.2.7.tgz',
+    },
+    {
+        platform: 'sunos',
+        version: '2.2.7',
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-2.2.7.tgz',
+    },
+
+    // version: '2.0.9',
+    {
+        platform: 'darwin',
+        version: '2.0.9',
+        location: 'https://fastdl.mongodb.org/osx/mongodb-osx-x86_64-2.0.9.tgz',
+    },
+    {
+        platform: 'win32',
+        version: '2.0.9',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2.0.9.zip',
+    },
+    {
+        platform: 'linux',
+        version: '2.0.9',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.0.9.tgz',
+    },
+    {
+        platform: 'elementary OS',
+        version: '2.0.9',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.0.9.tgz',
+    },
+    {
+        platform: 'sunos',
+        version: '2.0.9',
+        location: 'https://fastdl.mongodb.org/sunos5/mongodb-sunos5-x86_64-2.0.9.tgz',
+    },
+
+
+    // win32 + arch variants
+    //   ia32
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: 'latest',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-2008plus-ssl-latest.zip',
+        isMissing: true,
+    },
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: '4.0.1',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-2008plus-ssl-4.0.1.zip',
+        isMissing: true,
+    },
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: '3.6.1',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-2008plus-ssl-3.6.1.zip',
+        isMissing: true,
+    },
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: '3.4.1',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-3.4.1.zip',
+        isMissing: true,
+    },
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: '3.2.21',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-3.2.21.zip',
+    },
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: '3.0.15',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-3.0.15.zip',
+    },
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: '2.6.10',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-2.6.10.zip',
+    },
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: '2.4.13',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-2.4.13.zip',
+    },
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: '2.2.7',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-2.2.7.zip',
+    },
+    {
+        platform: 'win32',
+        arch: 'ia32',
+        version: '2.0.9',
+        location: 'https://fastdl.mongodb.org/win32/mongodb-win32-i386-2.0.9.zip',
+    },
+
+
+    // linux + arch variants
+    //   ia32
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: 'latest',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: '4.0.1',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-4.0.1.tgz',
+        isMissing: true,
+    },
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: '3.6.1',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-3.6.1.tgz',
+        isMissing: true,
+    },
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: '3.4.1',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-3.4.1.tgz',
+        isMissing: true,
+    },
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: '3.2.21',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-3.2.21.tgz',
+    },
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: '3.0.15',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-3.0.15.tgz',
+    },
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: '2.6.10',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-2.6.10.tgz',
+    },
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: '2.4.13',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-2.4.13.tgz',
+    },
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: '2.2.7',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-2.2.7.tgz',
+    },
+    {
+        platform: 'linux',
+        arch: 'ia32',
+        version: '2.0.9',
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-i686-2.0.9.tgz',
+    },
+
+
+    // linux + os variants
+    //   ubuntu
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'ubuntu', release: '0.0' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1404-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'ubuntu', release: '12.00' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1404-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'ubuntu', release: '12.04' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1204-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'ubuntu', release: '14.00' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1404-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'ubuntu', release: '14.04' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1404-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'ubuntu', release: '14.10' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1410-clang-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'ubuntu', release: '16.00' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1604-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'ubuntu', release: '16.04' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1604-latest.tgz',
+    },
+    //   elementary OS
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'elementary OS' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1404-latest.tgz',
+    },
+    //   suse
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'suse', release: '0' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'suse', release: '11' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-suse11-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'suse', release: '12' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-suse12-latest.tgz',
+    },
+    //   rhel
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'rhel', release: '0.0' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel-latest.tgz',
+        isMissing: true,
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'rhel', release: '5.0' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel55-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'rhel', release: '6.0' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'rhel', release: '7.0' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel70-latest.tgz',
+    },
+    //   fedora
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'fedora', release: '0' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel-latest.tgz',
+        isMissing: true,
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'fedora', release: '6' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel55-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'fedora', release: '12' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'fedora', release: '19' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel70-latest.tgz',
+    },
+    //   debian
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'debian', release: '0' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-debian-latest.tgz',
+        isMissing: true,
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'debian', release: '7.1' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-debian71-latest.tgz',
+    },
+    {
+        platform: 'linux',
+        version: 'latest',
+        os: { dist: 'debian', release: '8.1' },
+        location: 'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-debian81-latest.tgz',
+    },
+];
+
+
+describe('MongoDB Download Location variations', () => {
+    let getos = libUnderTest.__get__('getos');
+    beforeEach(() => {
+        // file detection & MD5 downloads shouldn't take a long time
+        this.timeout = 5000;
+    });
+    afterEach(() => {
+        libUnderTest.__set__('getos', getos);
+    });
+
+    let variations = VARIATIONS.filter((variation) => variation.only);
+    if (variations.length === 0) {
+        // none were called out
+        variations = VARIATIONS;
+    }
+
+    variations.forEach((variation) => {
+        const options = Object.assign({}, variation);
+        delete options.location;
+        delete options.os;
+        delete options.isMissing;
+        delete options.only;
+        const mongoDBDownload = new MongoDBDownload(options);
+
+        const { location, os, isMissing } = variation;
+        let description = `for ${ JSON.stringify(options) }`;
+        if (os !== undefined) {
+            description = `${ description } with OS ${ JSON.stringify(os) }`;
+        }
+
+        describe(description, () => {
+            beforeEach(() => {
+                if (os !== undefined) {
+                    // mock { dist, release }
+                    libUnderTest.__set__('getos', (callback) => {
+                        callback(null, os);
+                    });
+                }
+            });
+
+            it('returns a Download Location', () => {
+                return mongoDBDownload.getDownloadURI().then((downloadURLObject) => {
+                    const { href } = downloadURLObject;
+                    expect(href).to.equal(location);
+                });
+            });
+
+            if (isMissing) {
+                it('does not detect a Download File', () => {
+                    return mongoDBDownload.getDownloadURI().then((downloadURLObject) => {
+                        const { href } = downloadURLObject;
+                        return request(href, { method: 'HEAD' });
+                    })
+                    .then(assert.fail, (err) => {
+                        expect(err.statusCode).to.equal(403);
+                    });
+                });
+
+                it('fails to retrieve an MD5 Hash online', () => {
+                    return mongoDBDownload.getMD5HashOnline().then(assert.fail, (err) => {
+                        expect(err.statusCode).to.equal(403);
+                    });
+                });
+            }
+            else {
+                it('detects a Download File', () => {
+                    return mongoDBDownload.getDownloadURI().then((downloadURLObject) => {
+                        const { href } = downloadURLObject;
+                        return request(href, { method: 'HEAD' });
+                    })
+                    .then((results) => {
+                        const { etag } = results;
+                        expect(etag).to.not.equal(undefined);
+                    });
+                });
+
+                it('retrieves an MD5 Hash online', () => {
+                    return mongoDBDownload.getMD5HashOnline().then((md5) => {
+                        expect(md5).to.match(/^[a-fA-F0-9]+$/);
+                    });
+                });
+            }
+        });
+
+    });
+});