ftp.postgresql.org/pub/pgadmin/pgadmin4/yum/redhat/rhel-8-x86_64 :
pgadmin4-desktop-5.0-1.el8.x86_64.rpm
pgadmin4-desktop-5.1-1.el8.x86_64.rpm
pgadmin4-server-5.0-1.el8.x86_64.rpm
pgadmin4-server-5.1-1.el8.x86_64.rpm
postgresql13-libs-13.2-1PGDG.rhel8.x86_64.rpm