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

gen-gtkmm
1.0.1

This version was deleted from PyPI around 2023-12-31. Installing fails with:
$ pip3 install gen-gtkmm==1.0.1 ERROR: Could not find a version that satisfies the requirement gen-gtkmm==1.0.1
View other deleted versions of gen-gtkmm

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/2023-12-29/ \ gen-gtkmm==1.0.1
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:
gen_gtkmm-1.0.1-py2-none-any.whl (35.4KB)
gen_gtkmm-1.0.1-py3-none-any.whl (35.4KB)
gen_gtkmm-1.0.1.tar.gz (14.2KB)