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

panel
0.10.3a7

This version was deleted from PyPI around 2024-02-29. Installing fails with:
$ pip3 install panel==0.10.3a7 ERROR: Could not find a version that satisfies the requirement panel==0.10.3a7
View other deleted versions of panel

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/2024-02-28/ \ panel==0.10.3a7
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Or, download files manually

And install manually via pip:
panel-0.10.3a7-py2.py3-none-any.whl (7.7MB)
panel-0.10.3a7.tar.gz (8.4MB)