For future reference; a license key cannot be moved by the user himself. You have to go through OpenVPN Technologies Inc. support ticket system for a license key reissue. The process is simple; log on with your account at
www.openvpn.net and click the 'support' link at the top of the page. Open a ticket there and mention the license key that you need to have reissued/moved. When a license key is revoked the old key will still function for up to a maximum of 2 weeks. The new key can be used immediately.