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

musicscore2
1.4b2

This version was deleted from PyPI around 2023-09-24. Installing fails with:
$ pip3 install musicscore2==1.4b2 ERROR: Could not find a version that satisfies the requirement musicscore2==1.4b2
View other deleted versions of musicscore2

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/2023-09-23/ \ musicscore2==1.4b2
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:
musicscore2-1.4b2-py3-none-any.whl (105.6KB)
musicscore2-1.4b2.tar.gz (78.7KB)