I'm trying to install the Adafruit SAMD Boards package for my Adafruit QTPY microcontroller. Sadly it won't download.
Try installing the cores manually following this article: https://support.arduino.cc/hc/en-us/articles/360021232160-How-to-install-and-use-a-custom-core-version-in-the-IDE
I can't believe it... I fixed it by dissabling my whole antivirus. I had to dissable the documents map in AVG FREE... Now it did install. the topic can be closed.
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