First, nice to meet you as well. I've always longed to visit Indonesia, despite being a world citizen from the opposite side of the globe. Maybe if I give you a call sometime, we can enjoy chicken together someday. I'd enjoy that!
I am sorry to hear that your theme developer has shut off their support. The web is full of fly by night theme developers. I just hope yours is not one of them. Given that, I have run into a few of those crooks myself. I make sure that any new venture I embark upon is matched with a new and fully supported team. I am not saying that you've made mistakes. It's only my preference that I start over fresh in a new project, rather than sacrificing any code I already own.
Given that, I know that if something can be done, the support team behind this plugin can help.
If not, and if you do not have a large membership base, I would seriously look at a complete rebuild. I have had to do this a time or two, which has been hard. In the end, I have come out on top.
If you'd like to connect privately, give me a shout to my email. I'm not sure if this is against any TOS here, but you can reach me at hippfilms (at) gmail (dot) com.