You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

xformers
0.0.22.post4

This version was deleted from PyPI around 2024-01-24. Installing fails with:
$ pip3 install xformers==0.0.22.post4 ERROR: Could not find a version that satisfies the requirement xformers==0.0.22.post4

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2024-01-23/ \ xformers==0.0.22.post4
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)