Installation takes significantly longer because your computer has to "unpack" all those compressed files. These versions often come with all previous DLCs and updates pre-installed. Pro-Tips for New Players
Unlike most shooters, tanks in Red Orchestra 2 are fully crewed. You can see the entire interior, and you often need to coordinate with AI or other players to drive, aim, and load simultaneously.
Red Orchestra 2: Heroes of Stalingrad with Rising Storm on Steam