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

d4cmpp
1.242

This version was deleted from PyPI around 2025-03-14. Installing fails with:
$ pip3 install d4cmpp==1.242 ERROR: Could not find a version that satisfies the requirement d4cmpp==1.242
View other deleted versions of d4cmpp

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/2025-03-13/ \ d4cmpp==1.242
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Or, download files manually

And install manually via pip:
D4CMPP-1.242-py3-none-any.whl (1.8MB)
D4CMPP-1.242.tar.gz (1.7MB)