NetworkManager from home:JonathanKang:branches:GNOME:STABLE:3.26 project
Select Your Operating System
Add repository and install manually
For SLE 15 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:JonathanKang:branches:GNOME:STABLE:3.26/SLE_15/home:JonathanKang:branches:GNOME:STABLE:3.26.repo zypper refresh zypper install NetworkManager