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

mscore3
1.1.0

This version was deleted from PyPI around 2025-08-09. Installing fails with:
$ pip3 install mscore3==1.1.0 ERROR: Could not find a version that satisfies the requirement mscore3==1.1.0
View other deleted versions of mscore3

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/2025-08-08/ \ mscore3==1.1.0
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Or, download files manually

And install manually via pip:
mscore3-1.1.0-py2.py3-none-any.whl (38.7KB)
mscore3-1.1.0.tar.gz (36.6KB)