I have the same problem. I downloaded the trial version, paid and got a product key code that does not work. I got one response but it didn't help. I could download the full program and then apply the product key code, perhaps this would work, but I'm apprehensive that this would either wipe out the data I have entered, or I might not be able to restore the data from a backup I would create. Was anybody successful in installing the whole program and then loading in the previous data from a backup? UPDATE - this item was resolved, but I'm not sure how. I believe that possibly the key would not work with the trial version. I downloaded the full version and the key would still not work. I created a backup and uninstalled both versions and then re installed the program from the original full system download that I had saved (I'm emphasizing that I did not re-download). After this installation, the key worked AND, all my data that I had entered in the trial program was retained - I'm assuming that the installation searched certain file directories and identified it. I'm far from clear that this is what really happened, but this is my best guess.