I've never used it, but the documentation (https://docs.moodle.org/38/en/Installation_Package_for_OS_X) only mentions support for MacOS up to El Capitan which, of course, was a long time ago. I doubt that's true, but I would drop the maintainer, Ralf Krause, a message - https://moodle.org/user/profile.php?id=70180
Installing and upgrading help
Installing Moodle
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