I had an Arch install on linode and wanted to convert it to endeavouros. I believe that I did so properly. I copied the pacman.conf and endeavour-mirrorlist over to my arch install, installed endeavour-keyring, etc. The I downloaded the endeavouros-iso repo from github and copied the files from airrootfs folder over to my arch install as well, replacing /usr/lib/os-release, etc. I can now install endeavouros packages and neofetch reports endeavouros as my OS.
So did I do this properly? Are there any more tips or instructions I need to follow?
IMO, the idea of converting an Arch install to EOS is quite strange.
What you are doing is adding the EOS repo to Arch and making it identify as EOS. It is still an Arch install though. What you are left with is probably quite different than what you would get if you installed EOS from the ISO.
You won’t have any of our settings and your system wouldn’t be configured in an EOS way.