Activate Smart Designer (Legacy)
1. Open you CorelDRAW
For any activation error you are going to go into the Activation tab and try activating with the serial number. In that activation window it will either take the serial number or tell you a more detailed error. If you get a more detailed error, please take a screenshot and submit a support ticket if you already have a support ticket dealing with this issue attach it to that email.
(How to take a screenshot)