MarcelUsai:
Can someone please just tell the specific folder structure?
{link on the line following File > Preferences > More preferences can be edited directly in the file}
|_package_index.json
|_package_index.json.sig
|_packages
|_arduino
| |_hardware
| |_sam
| |_{package version (currently 1.6.11}
| |_unzip the latest package here (currently http://downloads.arduino.cc/cores/sam-1.6.11.tar.bz2)
|_tools
|_arm-none-eabi-gcc
| |_{tool version (currently 4.8.3-2014q1)}
| |_unzip tool here (find the download URL for your OS in the tools section of https://downloads.arduino.cc/packages/package_index.json)
|_bossac
|_{tool version (currently 1.6.1-arduino)}
|_unzip tool here (find the download URL for your OS in the tools section of https://downloads.arduino.cc/packages/package_index.json)