For some reason, I have had horrible times with installing ALL versions of Dimension Pro (so confused by all the versions and whether they are 32 or 64 bit, etc). For what ever reason, I had to reinstall Dimension Pro, trying to get some old projects working. I just installed every version of Dimension Pro in my old products page at Cakewalk, figuring what ever version the old project needs, it will access it. Dimension Pro installed but when it asks to register with the registration code, the registration code listed at my old Cakewalk account Products page, does not work. Im simply looking at the dialogue box that pops up with the serial number of the current Dimension Pro and I am copying and pasting the registration code that corresponds to the serial code (according to my Products list). And further, NONE of the registration codes listed for all the versions of Dimension Pro I purchased over those years will work, which I didnt think they would, of course, because they arent the reg codes for the corresponding serial number.