Error downloading json file in Arduino

I’m trying to update my layout using the suggested Arduino IDE but am not able to get the IDE to successfully download the json file. I get the following error when trying to select the keyboardio board under Tools -> Board Manager …:

Error downloading https://raw.githubusercontent.com/keyboardio/boardsmanager/master/package_keyboardio_index.json

Any help would be greatly appreciated as the current layout isn’t working for me when programming in C++.

Thanks,
Frank