Did you read the installation instructions already?
Yes. I know I'm not using the official versions of Ableton and Max but I thought there might still be a solution if this is the only error. I have native spleeter installed and working separate from Ableton and Max 4 Live.
Describe the issue
When I try to run the Spleeter M4L device I get this error message from the image below.

Info:
- Using spleeter-native
- OS: Windows 10 Home
- Ableton version 11
- Max version 8.3.1
Thanks for your work on this. I'll figure this out one way for another. I'd actually really like to make an improved version at some point that has a selector for the 2,4, and 5 stem options.