Applies to: Scarlett plug-in suite, Midnight plug-in suite
The Activate Button launches your Default Web Browser, so if this button isn't working it means you do not have a Default Web Browser set in your OS.
Here are instructions for setting a Default Web Browser in Windows and Mac. After setting this up the Activate Button will launch your browser and take you to the page to the Activation Page.
If you have any further trouble please Contact Support.