If You have Version 3.7.5. or higher You can also trasfer the licnse from one computer to an other by following this steps.
1. Ensure old computer is connected to Internet.
2. Install FVXC 3.7.5 or later on his old computer.
3. Launch FVXC, click top left corner. Select Update FVXC ID.
4. Click Deactivate button.