On my version 11, the menu Choice is "Deactivate". So you Deactivate on the old computer. You can uninstall if you want. Then when you install on a new computer, the Help menu will have an "Activate" choice.
It is not deactivated permanantly. As long as you have the serial number you can have it "Activated" on two computers. You could probably install it on 10, but only two can be activated and run properly.