Sorry, wish I could help, but I'm not familiar with OpenSuSE.
But let me try...
Have you used
zypper install 'wine-staging=5.10' ?
I guess it could work if the old version of wine is still available on your HD.
It definitely should work if you have added the correct repo which has the old (preferred) version still available.
According to the
OpenSuSE Wine Repo it seems that wine-staging 5.11 never was available on OpenSuSE?
So the latest version before 5.12 was 5.10 and those binaries are still available for some OpenSuSE versions.
Check the link - binaries are available (manual download) and also instructions how to add repositories, if that is what you wish for.