I installed the TypeTool DEMO to try it out before buying. Now that I've bought a license, I can't find anywhere to activate it. Do I really need to uninstall the DEMO version and install a new non-Demo version and where can i download that version without having to buy the software twice?

I was puzzled by this too.  I emailed orders@fontlab.com and they sent me a link to a full version, and a new serial number.