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

calibre
0.5.0

This version was deleted from PyPI around 2026-08-21. Installing fails with:
$ pip3 install calibre==0.5.0 ERROR: Could not find a version that satisfies the requirement calibre==0.5.0
View other deleted versions of calibre

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/2026-08-20/ \ calibre==0.5.0
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Or, download files manually

And install manually via pip:
calibre-0.5.0-py3-none-any.whl (48.0KB)
calibre-0.5.0.tar.gz (279.4KB)