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

qsim
0.1.0.dev0

This version was deleted from PyPI around 2025-01-14. Installing fails with:
$ pip3 install qsim==0.1.0.dev0 ERROR: Could not find a version that satisfies the requirement qsim==0.1.0.dev0
View other deleted versions of qsim

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/2025-01-13/ \ qsim==0.1.0.dev0
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:
qsim-0.1.0.dev0-py3-none-any.whl (4.4KB)
qsim-0.1.0.dev0.tar.gz (7.0KB)