Windows Community Edition with MYSQL

I migrated from sqllite to mysql on my Windows Seafile Server a while ago.

But the upgrade with MYSQL is not so easy. Currently I’m not able to upgrade to Version 5.X.
The descpition in the documentation is not sufficient to make the upgrade.
I restored my backup after my first attempt, because Seafile was not working anymore.

Has anybody expirience withe upgrading the Windows Server with MYSQL.