Unable to install Arduino megaAVR core

Official Hardware Nano Family Nano Every
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Arduino IDE 2.2.1 unable to install Arduino megaAVR core 1.8.8 to support Nano Every board. When INSTALL clicked in Boards Manager:

OUTPUT
Downloading packages
arduino:avr-gcc@7.3.0-atmel3.6.1-arduino5
Failed to install platform: 'arduino:megaavr:1.8.8'.
Error: 2 UNKNOWN: read tcp 10.8.8.67:56183->172.64.155.55:80: wsarecv: An existing connection was forcibly closed by the remote host.

Could this error be due to a corporate firewall rule?

I'm able to download the core package

core-ArduinoCore-megaavr-1.8.8.tar.bz2

Are there steps I can take to manually install the core using the contents of this file?

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