I am seeing a similar issue. When I tried to add SparkFun Apollo3 Boards using the Arduino boards manager, I get the following error: Error downloading https://github.com/sparkfun/Arduino_Apollo3/releases/download/v2.1.1/Arduino_Apollo3.tar.gz java.lang.RuntimeException: java.lang.Exception: Error…

My computer cant find "https://downloads.arduino.cc/packages/package_index.json"

mhixson May 16, 2023, 7:29pm 12

DrMantisToboggan:
Sparkfun Sysadmin here - Give it a try now

It just installed on my 1.8.19 Arduino IDE on MacOS.

Thank you!

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