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

fastdup
1.28

This version was deleted from PyPI around 2023-10-13. Installing fails with:
$ pip3 install fastdup==1.28 ERROR: Could not find a version that satisfies the requirement fastdup==1.28
View other deleted versions of fastdup

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/2023-10-12/ \ fastdup==1.28
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
fastdup-1.28-cp38-cp38-macosx_11_0_arm64.whl (31.4MB)
fastdup-1.28-cp39-cp39-macosx_11_0_arm64.whl (31.4MB)
fastdup-1.28-cp39-cp39-win_amd64.whl (33.8MB)
fastdup-1.28-cp310-cp310-macosx_11_0_arm64.whl (31.4MB)
fastdup-1.28-cp311-cp311-macosx_11_0_arm64.whl (31.4MB)