You can no longer simply "click buy" on a digital store to download it. How Players "Download" it Today
If you go looking for R.U.S.E. on major platforms today, you’ll run into a significant hurdle. In , Ubisoft officially removed the game from Steam and other digital storefronts.
Because the game is no longer for sale, it has entered the "grey area" of abandonware . Many fans turn to community-preserved versions or archives to keep the game alive, though these come with the standard risks of unofficial downloads. Why It’s Still Worth the Search