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

fastdup
1.56

This version was deleted from PyPI around 2024-01-18. Installing fails with:
$ pip3 install fastdup==1.56 ERROR: Could not find a version that satisfies the requirement fastdup==1.56
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/2024-01-17/ \ fastdup==1.56
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-1.56-cp38-cp38-macosx_11_0_arm64.whl (32.0MB)
fastdup-1.56-cp39-cp39-macosx_11_0_arm64.whl (32.0MB)
fastdup-1.56-cp310-cp310-macosx_11_0_arm64.whl (32.0MB)
fastdup-1.56-cp311-cp311-macosx_11_0_arm64.whl (32.0MB)