For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sleepingtux/openSUSE_Tumbleweed/home:sleepingtux.repo
zypper refresh
zypper install tuxedo-keyboard
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sleepingtux/openSUSE_Slowroll/home:sleepingtux.repo
zypper refresh
zypper install tuxedo-keyboard
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sleepingtux/15.6/home:sleepingtux.repo
zypper refresh
zypper install tuxedo-keyboard
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sleepingtux/15.5/home:sleepingtux.repo
zypper refresh
zypper install tuxedo-keyboard