Like I mentioned, I’d already tried the manual setup approach and it didn’t work. I think what changed is SDK Manager (on the Uninstall / Repair screen) showing that there were OS components installed on the Xavier (which it wasn’t showing previously), and it allowed me to remove them before proceeding.
Or you can finally try using the command line installation to see if it works. If it still doesn’t install smoothly, you may have to contact our technical support email for assistance.
I was able to get it working with the approach I mentioned previously, thank you.