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

ytdlp-bittube
2021.12.27

This version was deleted from PyPI around 2024-04-04. Installing fails with:
$ pip3 install ytdlp-bittube==2021.12.27 ERROR: Could not find a version that satisfies the requirement ytdlp-bittube==2021.12.27

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/2024-04-03/ \ ytdlp-bittube==2021.12.27
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: