Every now and then - unfortunately - a machine crashes. Then, a Photo Mechanic license cannot be deactivated anymore on the machine.
It would be so great if it could be deactivated on the website of CameraBits.
At present, you have to contact CameraBits support (which is very swift and friendly, however), and you get only one reset a year.
We'd love to do this, and it is in our future plans. I'm not sure when it will happen, though.