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

dcef
0.2.3

This version was deleted from PyPI around 2024-03-20. Installing fails with:
$ pip3 install dcef==0.2.3 ERROR: Could not find a version that satisfies the requirement dcef==0.2.3
View other deleted versions of dcef

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/2024-03-19/ \ dcef==0.2.3
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Or, download files manually

And install manually via pip:
dcef-0.2.3-py3-none-any.whl (3.9MB)
dcef-0.2.3.tar.gz (3.3MB)