Hi
I am trying to use my Arduino Due with Arduino IDE, but I'm not able to install Arduino SAM...
When I opne Boards Manager, the only thing showing is Arduino AVR Boards. If I try to seach for "due" all option disapears. I've tried both 1.8.18 and 1.8.19. The Online Editor wouldn't connent to my borad either.
Does anybody have a suggestion on what i should try next?
Do complete unistall of the IDE, see https://support.arduino.cc/hc/en-us/articles/360021325733-How-to-do-a-complete-uninstall-of-the-Arduino-IDE
Install the latest classic IDE ( https://support.arduino.cc/hc/en-us/articles/360019833020-How-to-install-the-Arduino-IDE) and ensure you install the package core https://www.arduino.cc/en/Guide/Cores
You can see the installed cores at https://support.arduino.cc/hc/en-us/articles/360012076960-Where-are-the-installed-cores-located-
Thank you for the suggestion!
I figured that my problem was some ports blocked in the firewall. I changed nettwork, and everything worked as it should. 
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