How to install the game form disk but not from the internet?

Seems I got the answer:

How to Install Mass Effect 3 from DVD (without download)
1.) Install Origin
2.) Let Origin Update to the current Version
3.) Restart Origin
4.) Enter your Mass Effect 3 Code in Origin
5.) Don’t start the Download, but close Origin with a right click on the Origin Icon in the Systray -> Exit
6.) Restart setup.exe from Disc 1, it will start Origin and the Installation from the DVDs

Installing ME3 from disk
1. C:\ProgramData\Origin\DownloadCache\ delete all files inside this folder
2. Close Origin process by right-clicking taskbar > Start Task Manager > go to Processes tab > find Origins.exe *32 > right click > select End Process
3. load up DVD wait for autorun
4. Origin will load - login
5. Enter your code if prompted (and haven't done so already)
6. installation from disc should begin.

From : Operator Abelardo.