As V2 software works on subscription, registered email id is the one which is added in your subscription while generating license key. You can provide the required email id to us to add in subscription. Same email id has to be entered while activating the software. After entering registered email id and subscription key, an activation code/OTP is generated and sent to your registered email id. Once the OTP is entered software will be activated and you can start using it.
Note: Generated OTP is valid for 15 mins. You can re-generate it if required.