If you want to move your IVAR installation to another PC, be sure to deregister the installed license beforehand.
Make sure it is deactivated by pressing the Deactivate button in System -> About -> License.
Note: If IVAR is uninstalled without deregistering the license beforehand, the license will remain in the registered state. Consequently, this license can not be used on another PC. Your PC must be connected to the internet to unregister.