How do you install bagapie assets in the 3.3 lts?

I don’t get it
online I find about installing it as an addon
I do so, and it fails, no errors are shown, nothing gets installed

You leave to leave it as a zip file.
I assume that is the problem.
Thats the most common problem with addons being installed.

you mean that I need to leave it as a zip file?
it indeed is a zip file, but that gives me that problem

Try to install your addon as it describes in the video below: