For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:windowmanagers/openSUSE_Tumbleweed/X11:windowmanagers.repo
zypper refresh
zypper install notion
For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:windowmanagers/openSUSE_Leap_15.2/X11:windowmanagers.repo
zypper refresh
zypper install notion
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:windowmanagers/openSUSE_Leap_15.1/X11:windowmanagers.repo
zypper refresh
zypper install notion
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:windowmanagers/openSUSE_Factory_ARM/X11:windowmanagers.repo
zypper refresh
zypper install notion
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:windowmanagers/15.4/X11:windowmanagers.repo
zypper refresh
zypper install notion
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:windowmanagers/15.3/X11:windowmanagers.repo
zypper refresh
zypper install notion