If you bought Nero Platinum as a subscription, you can upgrade to the latest Nero Platinum for free.
1. Please download and install the new version: click Nero Platinum Suite
2. Run Nero Start and register a Nero Account. The email address must be the one which you used for purchasing your Nero 2019 subscription.
Enter your email address in Nero Start and click 'Next', then click "Resend my password", your password for the Nero Account will be sent to the email address you provided. Enter the password in Nero Start to complete the registration of your Nero Account.
3. After you have registered your Nero Account successfully, the new Nero Platinum will be unlocked automatically. You can go to Account Settings >Manage my account > My products to check.