Installing TC3 with TC1/2 already installed
As you will gather lots of people have had problems with this-including me. I tried a number of suggestions from forum colleagues without success. I then retried some advice from ntesdorf (god bless him!) and it worked like a dream. It goes like this: having tried and failed to install TC3 uninstall it and remove any remnants in C:\Program Files\Auran\TC. Reboot. With the TC3 disc in the drive go to Add/Remove programs in Control Panel and click on TC1/2 but instead of deleting choose 'update'. You should find that the TC3 disc starts to load in the drive and patches TC1/2 into TC3. you must then go to C:\Program Files\Auran\TC\Settings and change the disc key from that of TC1/2 to the one that came with TC3. That should successfully load TC3.
Good luck
Frangles