The new version 2.19 is not working on the actual OpenSuSE Leap 15.4 distro because rainlendar is looking for glibc-2.33 or 2.34 but leap 15.4 ist still using glibc version 2.31.
Is there a chance to get a version compiled with glibc-2.31?
rainlendar2: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by rainlendar2)
rainlendar2: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by rainlendar2)
rainlendar2: /lib/x86_64-linux-gnu/libstdc++.so.6: version `CXXABI_1.3.13' not found (required by rainlendar2)
Since glib is not updated for the life of any LTS version of Ubuntu, you should always use the libraries associated with the oldest supported version of Ubuntu LTS to avoid errors. Until some time in April 2025 this is Ubuntu 20.04. Cheers!