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2021-04-15 at 2:40 PM #15390
Are you following the instructions from the top of this page to add the Mayfly board to your IDE: https://www.envirodiy.org/mayfly/software/
You should be able to copy-and-past the URL of the json file into the appropriate place in the IDE Preference window and then the IDE will fetch the file and load it properly. We haven’t made any changes to the board definition files in several years, so there shouldn’t be any problems. What version of the Arduino IDE are you using?