iTune installation: version reuqirement

Trying to install iTunes12.8.1 on MacBook with v11.1 (Big Sur).

It should be compatible with any OSX version starting with 10.10.5. However, when installing it, first I got a warning of the expired certificate, and, second, that it requires an OSX version 10.10.5 or earlier - instead of later.

What is the appropriate version of iTunes for OSX v11.1 Big Sur and where can I download it from?