Depending on the size of your library, the upgrade to 1.40 can be quite time consuming. That’s why this is also specifically mentioned in the release notes.
Interfering with the database upgrade is never such a good idea as it could at worst mess things up – especially if you keep jumping between versions, which means that Plex will attempt to migrate forwards and backwards in order to keep the database compatible with the installed version of your server.
PLEASE NOTE: This version makes changes to the database which will make it compatible only with server versions 1.31.2 or higher (released March 14). You will not be able to use your database on Plex Media Server versions lower than this after this update.
In order to roll back a database to an older version than 1.31.2 you would first need to downgrade to 1.31.2 (up to 1.32.8) and then downgrade from that version afterwards.
We have bumped the server version right up to 1.40.x to signal this change.
Please also be patient when updating to this version if you have a very large database and allow the upgrade process to finish.