no need to change your configuration. you could even leave the eval key in the system, as soon as there is a newer app release you will simply move back to the app release.
Those that have bought a subscription allow me (and the rest of our team) to spent time on such issues.
If anyone reads this and is too broke to afford the 15€ per user (and year) send a mail to feedback@kopano.io and you’ll receive a 30 day eval key as well.
Update: The holidays are coming up and the mentioned mailbox will not be checked as regularly anymore. Please instead request a trial key from Kopano Groupware Downloads - (by just downloading any item offered)