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

skill-sdk
1.1.5.dev0

This version was deleted from PyPI around 2023-10-09. Installing fails with:
$ pip3 install skill-sdk==1.1.5.dev0 ERROR: Could not find a version that satisfies the requirement skill-sdk==1.1.5.dev0
View other deleted versions of skill-sdk

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/2023-10-08/ \ skill-sdk==1.1.5.dev0
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:
skill_sdk-1.1.5.dev0-py3-none-any.whl (718.0KB)
skill-sdk-1.1.5.dev0.tar.gz (690.9KB)