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

byquant
3.8.12.0

This version was deleted from PyPI around 2023-09-27. Installing fails with:
$ pip3 install byquant==3.8.12.0 ERROR: Could not find a version that satisfies the requirement byquant==3.8.12.0
View other deleted versions of byquant

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/2023-09-26/ \ byquant==3.8.12.0
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:
byquant-3.8.12.0-py3-none-any.whl (678.6KB)
byquant-3.8.12.0.tar.gz (609.9KB)