Navigate to "Product Activations," enter your challenge code, and retrieve the to paste back into the plugin.
The recent “Dune 3 activation code” issue was fixed: activation failures caused by a server-side validation bug and mismatched code formats have been resolved. If you experienced errors, you should now be able to activate the game using a valid code; follow the troubleshooting steps below if you still see problems. dune 3 activation code fixed