Command and Conquer Red Alert 2 is now free as part of Origin's "On The House" promotion. Looks like it also includes the "Yuri's Revenge" expansion "Lead Soviet or Allied forces to world domination for free in this real-time strategy classic. Command & Conquer: Red Alert 2 is On the House!" https://www.origin.com/en-gb/store/free-games
For those of you running this on modern PCs, you may notice a sluggish frame rate and mouse movements. This is fixable according to this guide. Simply edit the .INI file and you should be good to go. I set the game to run at 1280x720 while editing the file and it looks really good on my HDTV. I recommend 720p for this game.