When you install a new versiobn of the program and start the Organizer, it will usually give you a pop-up asking if you want to convert the catalog from a previous version. However, if that tool doesn't automatically launch, contributor Barb O offers this manual solution:
Go to File menu Catalog command and you will see a button for Convert. Click that convert button to start the catalog conversion process manually.
Note that IF you have more than one catalog, each one converts separately.
BEFORE you start your new program, go to your old Organizer's catalog and select:
-- Catalog > Repair
-- File > Reconnect > All Missing Files
-- Catalog > Repair (again)
The logic here is that a "cleaned up" prior version catalog is less likely to have problems during the upgrade process.