Upgrading to version 6.60 has nothing to do with your situation. Not backing up your key file and losing it is the reason why it happened. I've had a key file for 3DGS for 8 years, and I haven't lost it once, nor any keys for any software for that matter, so I don't understand how anyone can lose these things if you take care to do the right thing and back up your purchased software. If you pay for something, you should make sure to back it up or very bad things can happen. So, don't blame a new version of 3DGS or Conitec for your misfortune. Take a look in the closest mirror.