Quick Centos Stream 9; enable EPEL and install KDE easily!
Install EPEL in 2 easy steps (Terminal)
sudo dnf config-manager --set-enabled crb
sudo dnf install epel-release epel-next-release
Install KDE (Terminal)
sudo dnf --enablerepo=epel,epel-next,crb group -y install "KDE Plasma Workspaces"