Its annoying because the installer will refuse to install the mod if it detect ANY change from the clean vanilla game which is kinda silly if you know what changes you've made and are sure they won't affect GWX, such as making changes to the .exe.
I'd have preferred an "override because I know what I'm doing" button.
You will need to start a new career though. I don't even know if it'll load properly or not after the install because part of what GWX changes is flotillas and where they're stationed.
__________________
|