For SUSE SLE-15 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pgajdos:expat-before/SUSE_SLE-15_Update/home:pgajdos:expat-before.repo
zypper refresh
zypper install texlive
For SUSE SLE-15-SP3 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pgajdos:expat-before/SUSE_SLE-15-SP3_Update/home:pgajdos:expat-before.repo
zypper refresh
zypper install texlive
For SUSE SLE-15-SP2 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pgajdos:expat-before/SUSE_SLE-15-SP2_Update/home:pgajdos:expat-before.repo
zypper refresh
zypper install texlive
For SUSE SLE-15-SP1 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pgajdos:expat-before/SUSE_SLE-15-SP1_Update/home:pgajdos:expat-before.repo
zypper refresh
zypper install texlive