For openSUSE Leap 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Sauerland/openSUSE_Leap_15.5/home:Sauerland.repo
zypper refresh
zypper install broadcom-wl
For openSUSE Leap 15.4 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Sauerland/openSUSE_Leap_15.4_Update/home:Sauerland.repo
zypper refresh
zypper install broadcom-wl
For openSUSE Leap 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Sauerland/openSUSE_Leap_15.3/home:Sauerland.repo
zypper refresh
zypper install broadcom-wl
For Kernel stable Backport QA run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Sauerland/Kernel_stable_Backport_QA/home:Sauerland.repo
zypper refresh
zypper install broadcom-wl