Sparkfun nRF52840 Mini development

Hi,

I am new at this.

I recently purchased a Sparkfun nRF52840 Mini and installed Arduino.

I followed the instructions on the development sheet for the card and just cannot get it to work.

There seems to be a problem with the board manager installation and the URL referenced in the documentation ( https://github.com/adafruit/arduino-boa … index.json).

Is there an updated URL to be used? Or a different way to install the board manager?

Can someone point me in the right direction as far as installing the board manager and all necessary libraries?

Thanks,

Fred