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

requests-cache
0.10.0.dev4

This version was deleted from PyPI around 2023-12-09. Installing fails with:
$ pip3 install requests-cache==0.10.0.dev4 ERROR: Could not find a version that satisfies the requirement requests-cache==0.10.0.dev4
View other deleted versions of requests-cache

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/2023-12-08/ \ requests-cache==0.10.0.dev4
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:
requests_cache-0.10.0dev4-py3-none-any.whl (52.0KB)
requests-cache-0.10.0dev4.tar.gz (2.2MB)