PLEASE NOTE:
Just extract the file named StarCraft_II_Beta_enUS_13891_Installer
"bcoz this is the Starcraft II beta installer"

once the installation is complete it will automatically runs update.. You may or may not allow to update


then after that download this file
STARCRAFT 2 Beta Launcher
and extract this on your starcraft 2 folder installed directory (use the Starcraft Beta Launcher when running your SC2)

then extract and put this anywhere
Starcraft AI Maps
but remember the folder where you put it since youll be using it on setting up your map folder for your launcher