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

cwtch
0.0.0a1

This version was deleted from PyPI around 2023-10-22. Installing fails with:
$ pip3 install cwtch==0.0.0a1 ERROR: Could not find a version that satisfies the requirement cwtch==0.0.0a1
View other deleted versions of cwtch

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/2023-10-21/ \ cwtch==0.0.0a1
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Or, download files manually

And install manually via pip:
cwtch-0.0.0a1-cp311-cp311-macosx_11_0_x86_64.whl (1.1MB)
cwtch-0.0.0a1.tar.gz (10.1KB)