Version-specific Moodle upgrade pages: minimum starting versions, server requirement jumps and the features each release removes.
Upgrading an out-of-support Moodle 4.1 LTS site to 4.5 LTS: the 4.1.2 starting point, PHP and database version jumps, plugin compatibility checks and the AI subsystem, Open Badges 3.0 and TinyMCE changes users will notice.
What breaks when moving to Moodle 5.0 and later: Atto, Chat, Survey, CAS authentication, MNet and Oracle are gone, Boost moves to Bootstrap 5, and themes, editors and course content must be checked before the upgrade.
Bringing a Moodle 3.9 or 3.11 site to a supported 4.x release in steps: the minimum versions each hop requires, PHP upgrades along the way, the redesigned navigation and course index, and plugin replacements.
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