Thanks Oliver. Like I said, I need to investigate GitHub a bit more.
Figured out how to get that version using the install script. Also realised that I was not pulling the latest version of Piaware.
In ~/adsb-receiver/bash/decoders/dump1090-fa.sh, search for "git clone! and add “–branch v3.7.1” Note that is two dashes before the “branch”. You should end up with:
git clone --branch v3.7.1 GitHub - flightaware/dump1090: Dump1090 is a simple Mode S decoder for RTLSDR devices
Do the same for ~/adsb-receiver/bash/feeders/piaware.sh to get version 3.7.1