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

masster
0.7.20

This version was deleted from PyPI around 2025-12-22. Installing fails with:
$ pip3 install masster==0.7.20 ERROR: Could not find a version that satisfies the requirement masster==0.7.20
View other deleted versions of masster

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/2025-12-21/ \ masster==0.7.20
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:
masster-0.7.20-py3-none-any.whl (24.3MB)
masster-0.7.20.tar.gz (24.2MB)