Correct you bought at a substancially reduced price of $59.00 the vbGallery only license which was when we aquired the product. The licenses where merged a year later.
You do not own a PhotoPost Pro license and you have now switched to a forum software only supported by PhotoPost Pro. Remember vbGallery only works with vBulletin. To run a gallery on SMF you must have a gallery script capable of running with that forum.
We have all the tools for you to migrate vbGallery to Pro but you must own a Pro license and install it to integrate with SMF before you can transfer old vbGallery data to Pro.