Please see the below screenshots of the Admin interfaces of the different versions of Deskpro. You can use these to identify which version of Deskpro you are currently using:
If you are using a version of Deskpro older than Legacy, contact support for details on how to upgrade.
Deskpro Legacy (Version 5)
Deskpro Version 4
Deskpro Version 3
Deskpro Horizon (Version 6)