The good news is that the Demo is fully functional, so you are able to use Waverazor for now... to be clear, the "DEMO MODE" light is still on in the Main UI?
Would you email me, info(a)mok.com with your Tracktion account details (don't post them here), and I will have the Tracktion admin take a look at your account and see what happened there.
It should have been as simple as the steps you took, after purchasing, you can unlock again with your account and it should show registered.
Doh! Silly me on the minutes/days/hours... We tested with 1 hour demo mode before releasing, so until now I've never seen anything longer than 59 minutes. I will fix that in the next build... for now just consider it "29 days; aka: 718 hours; aka: 43086 minutes" ;)