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

cdk-demo-construct
0.0.249

This version was deleted from PyPI around 2023-12-16. Installing fails with:
$ pip3 install cdk-demo-construct==0.0.249 ERROR: Could not find a version that satisfies the requirement cdk-demo-construct==0.0.249
View other deleted versions of cdk-demo-construct

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/2023-12-15/ \ cdk-demo-construct==0.0.249
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
cdk_demo_construct-0.0.249-py3-none-any.whl (21.2KB)
cdk-demo-construct-0.0.249.tar.gz (22.0KB)