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

aviatrix-migration
0.2.57

This version was deleted from PyPI around 2024-04-19. Installing fails with:
$ pip3 install aviatrix-migration==0.2.57 ERROR: Could not find a version that satisfies the requirement aviatrix-migration==0.2.57

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/2024-04-18/ \ aviatrix-migration==0.2.57
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)