Im having the same issue and my purchase date is june 6th, i have a RED upgrade button that opens a dialog asking for a product key, but the ver 4 key does nothing. I have an open ticket and so far nothing they have instructed me to do works. Log in log out ..... didnt work. Waiting for the next suggestion or fix. i bought 4 up from 3.5.6. ver 5 came out 3 days after my upgrade, if i am having problems it is an easy leap that many others must also be having issues.,