You downloading for Windows, right? Once the .zip folder is downloaded, open the .zip file, and extract the game folder inside the .zip file by dragging it to your desktop. It will decompress, and you will have the game folder on your desktop ( you no longer need the .zip folder ). Open the game folder, and locate the game file and double click it. This should run the game. If fullscreen is too laggy and chugs framerate, try the windowed version. Hope that helps!