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

gma
2.0.9a3

This version was deleted from PyPI around 2024-04-18. Installing fails with:
$ pip3 install gma==2.0.9a3 ERROR: Could not find a version that satisfies the requirement gma==2.0.9a3
View other deleted versions of gma

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/2024-04-17/ \ gma==2.0.9a3
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:
gma-2.0.9a3-cp39-cp39-win_amd64.whl (35.1MB)
gma-2.0.9a3-cp310-cp310-win_amd64.whl (35.0MB)
gma-2.0.9a3-cp311-cp311-win_amd64.whl (35.0MB)
gma-2.0.9a3-cp312-cp312-win_amd64.whl (35.5MB)