For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bespokesynth:libs/openSUSE_Tumbleweed/home:bespokesynth:libs.repo
zypper refresh
zypper install squashfuse
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bespokesynth:libs/15.6/home:bespokesynth:libs.repo
zypper refresh
zypper install squashfuse
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bespokesynth:libs/15.5/home:bespokesynth:libs.repo
zypper refresh
zypper install squashfuse