Hi, I want to install arduino due board in IDE 1.6.5. The PC which I am using for installation has no internet connectivity. Is it possible to download and install it manually ?
Yep, get Arduino on a PC with internet and install the board via the manager. After install the files are in "%appdata%\Arduino15\packages\arduino" (just copy past to explorer without quotes). Just copy them to a USB stick and recopy them to the same location on the internetless PC.
Btw, why a PC without internet in this day and age?
Thank you very much. :-)