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

syngen
0.7.0rc4

This version was deleted from PyPI around 2024-01-17. Installing fails with:
$ pip3 install syngen==0.7.0rc4 ERROR: Could not find a version that satisfies the requirement syngen==0.7.0rc4
View other deleted versions of syngen

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/2024-01-16/ \ syngen==0.7.0rc4
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:
syngen-0.7.0rc4-py3-none-any.whl (1.2MB)
syngen-0.7.0rc4.tar.gz (1.2MB)