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

blackboardsync
0.9.12b7

This version was deleted from PyPI around 2023-10-01. Installing fails with:
$ pip3 install blackboardsync==0.9.12b7 ERROR: Could not find a version that satisfies the requirement blackboardsync==0.9.12b7
View other deleted versions of blackboardsync

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/2023-09-30/ \ blackboardsync==0.9.12b7
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Or, download files manually

And install manually via pip:
blackboardsync-0.9.12b7-py3-none-any.whl (220.7KB)
blackboardsync-0.9.12b7.tar.gz (280.9KB)