REALLY IMPORTANT!!!: When you install the game, always run it as an administrator. Otherwise, you won't be able to save your progress or update the game. When you download the game, just run the installer inside the .rar file and a shortcut will be created in your desktop. As I said above, it is really important to always run the game as an administrator, so I would recommend you to right click the shortcut, click on Properties, go to the Compatibility tab and ticking the Run as an administrator check-box and click the Apply button so you don't have to worry anymore. Then, as I can't update the installer with every single small update I do, I recommend double-clicking the shortcut and clicking on "Check for updates" before playing for the first time, so that you have the most bug-free experience. I would do this every time I play, because updates will come out very often introducing features, quests, playable characters, bug fixes and more.