There's no limit to the amount of demos you can use - feel free to keep creating them. We may be able to manually extend the demo expiry for you (may - I'm not actually sure). To do that and other license and purchasing queries feel free to Contact Us | XenForo
Sure, I assumed they weren't affiliated but thanks anyway. I've been emailing with them.. emails appear to have an IP address from France that's listed on many SPAM reports but website says they're in Cheyenne, WY. Email verbiage looks like it has gone through a language converter or just plain bad English. They said they've done 100's of migrations to XenForo but couldn't produce a single URL and can't find any mention of them here. Either way, I definitely won't be doing anything with them!