You can install if brave Gnome 42 beta by adding this to your pacman .conf
[fcgu]
Server = https://$repo.fabis.cafe/$repo
Server = https://vmi394248.contaboserver.net/$repo
Server = https://stream.itmotr-radio.com/$repo
Server = Home | Inetol
Server =
then pacman -Syu
It works fine here as usual some extensions will need tweaking in ~home/local/share/gnome shell /extensions Metadata file as user to
"shell-version": [
"40",
"42" save file reboot
Some are actualy on the gnome extensions site also