To renew RDS grace period, you need to find the following registry key and delete it.

“HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod”

Before you can delete the registry key, you need to change ownership. You can do that by following these steps:

1. Right-Click on the key.
2. Click on “Permissions”.
3. Click on “Advanced”.
4. Click on “Owner”.
5. Select “Administrators”.
6. Click on “Apply”

You can now delete the key. Reboot the server and you now have a new grace period.