I believe the user as I put in the commands on their web site is me “limo”
And I did
sudo chmod g+rw /home/limo/
and
sudo chmod g+rw /home/limo/Downloads/
I even tried
sudo chmod -R g+rw /home/limo/
I did the same on the other machine (Kubuntu) and it is working fine.
The only difference that in Arch it is “rslsync” not “resilio-sync”