In fact if I rename the existing lc.dat to 'old lc.dat', start PCB layout and enter my registration details to get a new lc.dat - the old and new files compare the same. I can't see any other lc.dat files on my C: drive at all. I don't think I had an earlier version installed but I do have DipTrace models3d from the standard version. Hmm, I have this problem also with the same beta version and bit Win7 Pro 64. The file you should delete is C: Users All Users DipTrace Data lc.dat. If you don't want to have two versions on the same machine, you can remove old license file manually and software will find new license file.
Installing versions 2.3 and the beta is one way to solve the problem. When you start DipTrace software finds old license file first and it is freeware version. While registering the beta version new license file appears in different folder.
After unistalling version 2.3 old license file remains in system. We investigated the issue and found the reason of the problem. I have internet access turned on when I enter registration details. I am using Diptrace 2.3.5.2 BETA on Windows 7 Home Premium 64-bit. Please could you advise on how I can make Diptrace remember my registration details. I have tried first running Diptrace PCB as administrator and then entering my registration details, but it still forgets them when I close and re-open the programme. However, I have to re-enter my registration details every time I re-open Diptrace PCB. Hello, I recently upgraded from the freeware version by entering my user name and registration key.