Paul, I’m getting the same error that Matt is getting when trying to install the Sparkfun Apollo3 Boards, following the instructions exactly under Artemis Software Setup. I’m running Arduino IDE 1.8.19 on both my iMac (macOS 10.15.7) and my Raspberry Pi 4B Rev 1.2. Regardless of which version I select at the Boards Manager I get the same error when I click “Install.” On the mac the error is: “Error downloading https://static.sparkfun.com/large/gcc-a … ac.tar.bz2”. On the Pi I get: “Tool arm-none-eabi-gcc is not available for your operating system”.
The instructions do not indicate having to upgrade the Arduino IDE to 2.1.0, which is problematic with the Pi anyway. Any other suggestions?
Dan