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

tdf3sdk
1.0.0a699

This version was deleted from PyPI around 2025-05-20. Installing fails with:
$ pip3 install tdf3sdk==1.0.0a699 ERROR: Could not find a version that satisfies the requirement tdf3sdk==1.0.0a699

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/2025-05-19/ \ tdf3sdk==1.0.0a699
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