## based on https://github.com/lioonline/OS-X-El-Capitan
## pkg file link - http://osxapps.itunes.apple.com/apple-assets-us-std-000001/Purple30/v4/cc/62/24/cc62243b-7ed7-74cd-d47e-374bc470ecdf/diu414781394017735583.pkg

# !!IMPORTANT!! Run this from folder where you have downloaded or copied diu414781394017735583.pkg file

#create a tmp folder
mkdir sierraRoot && cd sierraRoot

#create a folder structure to match apple server
sudo mkdir -p ./apple-assets-us-std-000001/Purple30/v4/cc/62/24/cc62243b-7ed7-74cd-d47e-374bc470ecdf/

#move downloaded pkg file to proper path
sudo mv ../diu414781394017735583.pkg ./apple-assets-us-std-000001/Purple30/v4/cc/62/24/cc62243b-7ed7-74cd-d47e-374bc470ecdf/

#start a web server when you are in "sierraRoot" folder
sudo python -m SimpleHTTPServer 80

#edit your mac's /etc/hosts file to add following line

sudo echo "127.0.0.1 	osxapps.itunes.apple.com" >> /etc/hosts

#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

# Open "App Store" app on Mac and run update. 
# It should download pkg file from local/LAN server

#Important - remove /etc/hosts entry when done, for "App Store" to work