Hello, Jeff. There is no "trade in" program, if by that you mean exchange your product; however, both products work well with vBulletin 3.5. If you look at the threads in this section you can do the research to determine if you want to change products, but I believe since you already have PhotoPost PRO installed and running you will be happy with it as is.
Please do not PM me for support or sales questions. Thank you for your understanding.