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

flexible-fl
0.6.1b1

This version was deleted from PyPI around 2025-05-01. Installing fails with:
$ pip3 install flexible-fl==0.6.1b1 ERROR: Could not find a version that satisfies the requirement flexible-fl==0.6.1b1
View other deleted versions of flexible-fl

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/2025-04-30/ \ flexible-fl==0.6.1b1
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Or, download files manually

And install manually via pip:
flexible_fl-0.6.1b1-py3-none-any.whl (83.9KB)
flexible-fl-0.6.1b1.tar.gz (51.4KB)