Sometimes you need to unregister your license key, for example to transfer your license key to other computer before other user starts using your current computer. This is done by going to Use a license server is unchecked, and pressing the OK button of the dialog. This brings up a confirmation dialog in which you select between falling back to the license key entered previously (for the case of releasing a floating license and reverting to the individual license entered previously in the Register dialog) and removing your license key from your user account of the computer.
→ to display the license registration dialog, making sure the text area for the license key is empty and the checkbox