My computer cant find "https://downloads.arduino.cc/packages/package_index.json"

Is this still the case 2 years later? I’m using Arduino IDE 1.8.19 on Mac OS 10.13.6 (High Sierra) and trying to install the Apollo3 boards definition results in:

Error downloading https://static.sparkfun.com/large/gcc-a … ac.tar.bz2

However, if I point my web browser at that URL it does indeed download a 106MB bzip file.

Anyone know what’s going on there?