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

ssh2net
2019.9.21

This version was deleted from PyPI around 2023-12-29. Installing fails with:
$ pip3 install ssh2net==2019.9.21 ERROR: Could not find a version that satisfies the requirement ssh2net==2019.9.21
View other deleted versions of ssh2net

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/2023-12-28/ \ ssh2net==2019.9.21
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Or, download files manually

And install manually via pip:
ssh2net-2019.9.21-py3-none-any.whl (28.2KB)
ssh2net-2019.9.21.tar.gz (25.5KB)