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

pyfast
4.7.1

This version was deleted from PyPI around 2024-03-19. Installing fails with:
$ pip3 install pyfast==4.7.1 ERROR: Could not find a version that satisfies the requirement pyfast==4.7.1
View other deleted versions of pyfast

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/2024-03-18/ \ pyfast==4.7.1
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Or, download files manually

And install manually via pip:
pyFAST-4.7.1-cp36-abi3-macosx_10_13_x86_64.whl (153.7MB)
pyFAST-4.7.1-cp36-abi3-macosx_11_0_arm64.whl (42.5MB)
pyFAST-4.7.1-cp36-abi3-manylinux1_x86_64.whl (367.9MB)
pyFAST-4.7.1-cp36-abi3-win_amd64.whl (250.9MB)