Welcome - if the installer cannot find the game, you can select Browse and point it to the game directory manually. I believe Origin installs Red Alert 2 & Yuri's Revenge at roughly this path: "Program files > Origin Games > Command & Conquer Red Alert 2 Yuri's Revenge"
Thanks for the help Grant. I've just copied it into where you said. Copied an image of what im seeing Is that correct? I know you probably wanna smash your head in with a rock and im sorry lol