You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
multis was reported malicious
OSV:MAL-2025-191797 - Malicious code in multis (PyPI)

multis
1.6.0

This version was deleted from PyPI around 2025-02-18. Installing fails with:
$ pip3 install multis==1.6.0 ERROR: Could not find a version that satisfies the requirement multis==1.6.0
View other deleted versions of multis

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/2025-02-17/ \ multis==1.6.0
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:
multis-1.6.0-py3-none-any.whl (57.6KB)
multis-1.6.0.tar.gz (45.0KB)