Unable to load maps on Origin Red Alert 3 Uprising game?

Installing maps is very simple to do - however for reason the method doesn't work when I try to add maps to my game it is clear this is something to do with Origin, as I have never had this problem in the past when adding maps/mods to games that aren't loaded via Origin.

Any ideas - the %appdata% method should work but it doesn't I am using Windows 10 Pro.

Someone else must have had the very same problem? I am using Windows 10 Pro albeit on my Mac Desktop using Bootcamp