Ubisoft game launcher is in my steam disc after installing it what should i do with it

I don't know to Install the game from the assassins creed revelations kaos.its my first time installing this type of compressed game.please tell me each n everything briefly please..................

What's the use of ubisoft game launcher and where to install it for assassins creed revelations kaos

Hi man i did that but i guess i am doing something wrong in the process. First i copy assassins creed kaos 3.5gb and extract with winrar n using install.exe the last process of unpacking i crack 5 of the crack in assassins creed revelations where i have unrar it and click on ACRSP.exe but it shows ...

Hi pals! I have got problem in assassins creed revelations that when i clik on acrsp.exe it doesn't launch can anybody help me installing the game step by step to end until game launches i request