When you uninstall Registry Mechanic it still leaves license information on the machine. If you re-install Registry Mechanic, the old information is automatically pulled in. I have a situation when a PC went to a different division and I need to update the license with a different user and license number without having to format the entire drive. Have deleted all of the apparent references to Registry Mechanic in the registry but this has not solved the issue.
Tech Support has been less than helpful with this.