You automatically get when creating an account 14 free GOG games (+ some dlc’s) added to your account so you have nothing to loose, only to receive! Make sure the setup file is downloaded into your download folder before running the Crosstie, so that Crossover recognizes the file and launches the setup automatically. Click on the links mentioned here, create an account using the signup in the top bar on the GOG.com website and buy the game. I recommend to buy the GOG.com version which is DRM free and works straight away out of the box. Other Sudden Strike ported games on the site are: Sudden Strike Gold, Sudden Strike 2 and Sudden Strike 2 – Resource War.
So if you haven’t Crossover yet, then sign up here and buy the program or if you want to test it first, for the 14 days trial. Or use the Porting Kit alternative. This page contains information + tools how to port Sudden Strike 3 (Includes Sudden Strike 3 – “The Last Stand” and “Arms for Victory” so you can play it on your Mac just like a normal application. Welcome to the “Sudden Strike 3” for Mac game page.