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

arrm
0.0.4

This version was deleted from PyPI around 2023-10-26. Installing fails with:
$ pip3 install arrm==0.0.4 ERROR: Could not find a version that satisfies the requirement arrm==0.0.4
View other deleted versions of arrm

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/2023-10-25/ \ arrm==0.0.4
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:
arrm-0.0.4-cp36-cp36m-win_amd64.whl (20.8MB)
arrm-0.0.4-cp37-cp37m-win_amd64.whl (20.8MB)
arrm-0.0.4-cp38-cp38-win_amd64.whl (20.8MB)
arrm-0.0.4-cp39-cp39-win_amd64.whl (20.8MB)