mono-complete from openSUSE:Backports:SLE-15-SP3 project
Select Your Operating System
Add repository and install manually
For step run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Backports:SLE-15-SP3/step/openSUSE:Backports:SLE-15-SP3.repo zypper refresh zypper install mono-complete
For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Backports:SLE-15-SP3/standard/openSUSE:Backports:SLE-15-SP3.repo zypper refresh zypper install mono-complete