An arcade version of Super Street Fighter IV was released by Capcom in December 2010, titled Super Street Fighter IV: Arcade Edition. Arcade Edition added Yun, Yang, Evil Ryu and Oni to the roster, as well as changes to the existing characters.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.