You will need to have the trial version of the application installed.  

If you do not have it, please use the Downloads page or this page

Launch Movavi product and click Activate on the welcome screen. 

Else, you can open the Help menu in full-feature mode and select Activate software.

Paste your license key into the menu. 

If you have issues activating the software, please ensure that you are using the correct version of the application, that you are using the correct application.

If you have a firewall or your PC is not connected to the internet, please follow the offline activation scenario

In case the problem still persists, please contact us and send a screenshot that would show the particular step where does an error occur.