You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
mult-flow was reported malicious
OSV:MAL-2024-5381 - Malicious code in mult-flow (PyPI)

mult-flow
1.0.2

This version was deleted from PyPI around 2024-04-24. Installing fails with:
$ pip3 install mult-flow==1.0.2 ERROR: Could not find a version that satisfies the requirement mult-flow==1.0.2
View other deleted versions of mult-flow

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/2024-04-23/ \ mult-flow==1.0.2
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Or, download files manually

And install manually via pip:
mult_flow-1.0.2-py3-none-any.whl (2.2KB)
mult_flow-1.0.2.tar.gz (1.6KB)