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When running the installation script on a raspbian buster installation (to manually update to 3.2.1 from 3.0.6):
there is an error because it remarks it is not for my installation, I think the problem is in the version check "-o" instead of "-e" at line 17.

There is also a problem with the script, requiring a version for libmosquitto1 that is not available in the buster distribution, even after update: is there a revised version of the script or a workaroud that can be used for the update?

Thank you.

You are right - should be an "-a". Thank you for pointing us to this error

There is a dependency from old libmosquitto1 on buster and on bullseye it is a new one. On buster it is a bit old and you can replace it with one in the libs/ folder.

This is the package on buster: https://packages.debian.org/buster/libmosquitto1