For Pop! the Cosmic-epoch can be install via
sudo nano /etc/gdm3/custom.conf
comment out wayland = false
sudo apt-manage add popdev:cosmic-session
sudo apt install cosmic-session
restart
click on the "gear" on login page.
There are "COSMIC", "Pop" and "Pop on Wayland"
If I have Fedora, how can i install and try COSMIC ?