Errors flashing on macOS

Development Tools IDE 2.x
3

I've also tried downgrading the Arduino megaAVR Boards package and ran into the same issue on all these versions:

  • 1.8.8 (latest and consistent with GitHub tag history)
  • 1.8.7
  • 1.8.6
  • 1.8.5
  • 1.8.4
  • 1.8.3.
  • 1.8.2
  • 1.8.1

When I tried to go back to 1.6.26 (the revision before 1.8.1), I get an error because the Arduino Nano Every is not listed. But this is what I'd expect since v1.6.26 was released on March 19, 2019 per the Github history, and the Arduino Nano Every was announced for pre-order after that, on May 31, 2019 (link).

So it seems the board package version is not the issue.