Well maybe the support isn't on the forum, but when I clicked support under the contact us option on the Web site, it lists Manga Maker as one of the products that is supported by this Web site. But you asked who the deleveoper was, and I figured you would know that information already if you are selling the product, because it said you were a staff member.
Also, when I go to find Manga Maker in Steam and click the support option, it lists rpgmakerweb.com as the support contact. So if that's not correct to use this forum, I think Steam should be updated. It's confusing because I only bought the product here and all of the support links go to this forum.
I uninstalled the trial edition and retarted the computer and it started working after that.
Thanks for the help.