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

opclabs-mqtt
5.72.0rc18

This version was deleted from PyPI around 2023-11-24. Installing fails with:
$ pip3 install opclabs-mqtt==5.72.0rc18 ERROR: Could not find a version that satisfies the requirement opclabs-mqtt==5.72.0rc18
View other deleted versions of opclabs-mqtt

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/2023-11-23/ \ opclabs-mqtt==5.72.0rc18
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:
opclabs_mqtt-5.72.0rc18.tar.gz (5.8MB)