Very useful. Learned something new: Moodle 3.8 supports PHP 7.4 since release 3.8.3 - since 6. May 2020 https://docs.moodle.org/dev/index.php?title=Moodle_3.8_release_notes&type=revision&diff=57411&oldid=57064.
Installing and upgrading help
Upgrading an old version of Moodle
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