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

ftbx
0.1.dev275

This version was deleted from PyPI around 2025-03-15. Installing fails with:
$ pip3 install ftbx==0.1.dev275 ERROR: Could not find a version that satisfies the requirement ftbx==0.1.dev275
View other deleted versions of ftbx

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/2025-03-14/ \ ftbx==0.1.dev275
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Or, download files manually

And install manually via pip:
ftbx-0.1.dev275-py3-none-any.whl (50.8KB)
ftbx-0.1.dev275.tar.gz (198.7KB)