Hi Helen,
We don't have best solution to save the Amenity Category names after installing new OS Property version. But you can try this solution.
1. Open language files of OS Property. For example: root > language > en-GB > en-GB.com_osproperty.ini and root > administrator > language > en-GB > en-GB.com_osproperty.ini by note pad
2. Find the lines for Category names and copy them for backup.
3. After installing new OS Property version, re-open language files and migrate the backup lines to language files (of new OS Property version)
Thanks
Dam