If you have an installed copy of Revo Registry Cleaner Pro that is already activated, but its license has expired or is near its expiration date, you can update/extend your subscription with a newly purchased license.
Start Revo Registry Cleaner Pro.
Click the Menu button (in the upper right corner), and select Update Subscription.
In the registration window make sure the Online Activation option is selected.
In the first field you should see your current user name already entered.
In the second field you need to enter your new serial number.
After both fields are filled out, click Activate online. Revo Registry Cleaner Pro will contact its activation server.
If the activation is successful, you should see this message. Simply click Finish.
Restart Revo Registry Cleaner Pro.
You can verify if your subscription has been properly updated from the About page: click the Menu button (in the upper right corner), and select About.
You should see your newly entered serial number, along with the expiration date and total remaining days of your subscription.