Comments - Installing on Windows 2008
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If there is no wizard (have not checked myself, so can't tell why) there should still be a command line utility 'mysql_upgrade_service.exe' you can run from elevated prompt, that does it without much UI. This upgrades services, and you'd need to know the service name to use it.
https://mariadb.com/kb/en/mariadb/upgrading-mariadb-on-windows/#mysql_upgrade_service