Are you sure you’re placing the MapPress license in the settings field marked ‘MapPress license key’? I ask because it’s sometimes easy to place it in the MapBox license or Google license fields by accident.
I tested your license key and it worked for me. Perhaps the server was down when the key was checked? Give it another try (delete the license key, save the MapPress settings, and then re-enter it and save again).
If it’s still not working, you can send a login and I’ll have a look.
I don’t know about Wordfence, but normally once the license key has been set, you can use automatic update or go to your plugins screen and update the plugin there directly – no need to manually install.