pkg file link - http://osxapps.itunes.apple.com/apple-assets-us-std-000001/Purple3/v4/74/d2/82/74d28291-9db9-7ae2-305d-9b8b3f5fd463/ftk3252456602304584541.pkg
#create a tmp folder
#create a folder structure to match apple server
#move downloaded pkg file to proper path
#start a web server when you are in "elCapitanRoot" folder
#edit your mac's /etc/hosts file to add following line
#if you are in rtCamp's office, you can try following LAN server #sudo echo "192.168.0.2 osxapps.itunes.apple.com" >> /etc/hosts
#Important - remove /etc/hosts entry when done, for "App Store" to work