I have started the trial of Video Pro X. I was wondering if it came with every title template that the paid version does; or when you purchase, does it install more templates, transitions, etc.
ALL trial versions of Magix software are "limited" when compared with the purchased versions. Once the program has been paid for and registered the user has access to download a considerable amount of Additional Content, which, in the case of VPX, includes templates, transitions, effects etc., etc..
As a guide to you, this is the available additional content screen for the purchased version of VPX 12. (As you can see, I have all of it already installed):