First you need to install one of the following solutions for running Windows applications on your OS X. 1a. Emulate Windows applications via Wineskin (Freeware) or CrossOver (Shareware) & .NET Framework 2.0. 1b. Run Windows on Virtual machine: Boot Camp (Freeware, Built-in) VirtualBox (Freeware) Parallels Desktop for Mac (Shareware) vmWare Fusion (Shareware) 2. Download the game client and extract it. 3. Run updater to grab all the latest files. 4. Run FOConfig.exe and FO2238Config.exe in client folder to change settings. 5. Play!