For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:duwe:Teres-I/openSUSE_Tumbleweed/home:duwe:Teres-I.repo
zypper refresh
zypper install kernel-default
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:duwe:Teres-I/15.6/home:duwe:Teres-I.repo
zypper refresh
zypper install kernel-default
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:duwe:Teres-I/15.5/home:duwe:Teres-I.repo
zypper refresh
zypper install kernel-default