I believe Phillips explained this on their site...you have to rename you current gallery.

Actually it prompts you if you want to merge or replace! Anyone want to try the merge funtion and report if it works? (I would still make a copy of the original gallery)

Another nice feature is if you uninstall the Phillips Pronto Professional Software, it will ask you if you want to save your gallery and database; and also allow you to specify where you want it saved.

I always like to experiment with the install/unistall of software BEFORE modifying :)