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

cdk-cr-constructs
2.1.581

This version was deleted from PyPI around 2025-04-26. Installing fails with:
$ pip3 install cdk-cr-constructs==2.1.581 ERROR: Could not find a version that satisfies the requirement cdk-cr-constructs==2.1.581
View other deleted versions of cdk-cr-constructs

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/2025-04-25/ \ cdk-cr-constructs==2.1.581
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Or, download files manually

And install manually via pip:
cdk_cr_constructs-2.1.581-py3-none-any.whl (14.8MB)
cdk_cr_constructs-2.1.581.tar.gz (14.8MB)