But, based on ideas above, if I have a GG installation on desktop and a Steam installation on laptop, can I beta patch the GG installation by copying over the Steam CK2 beta installation files on the laptop to my GG installation on the desktop? Or could I do this but would need to use Steam on the desktop as well to copy?
Or is there another way?
If you have the Steam version anyway, why not install it on both? If there's some reason you don't want Steam on your desktop you can just copy over the entire CK2 beta folder though.