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

pk1-jet
0.1.0b1

This version was deleted from PyPI around 2024-02-13. Installing fails with:
$ pip3 install pk1-jet==0.1.0b1 ERROR: Could not find a version that satisfies the requirement pk1-jet==0.1.0b1
View other deleted versions of pk1-jet

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/2024-02-12/ \ pk1-jet==0.1.0b1
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:
pk1-jet-0.1.0b1.tar.gz (1.4MB)