Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ithod:updated/openSUSE_Tumbleweed/home:ithod:updated.repo
zypper refresh
zypper install gnucash
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ithod:updated/15.6/home:ithod:updated.repo
zypper refresh
zypper install gnucash
Para 15.5 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ithod:updated/15.5/home:ithod:updated.repo
zypper refresh
zypper install gnucash