cant start KDE

I agree. Nevertheless it would be nice if the OP said something :wink:

FWIW the 1-click victimaization is fixed AFAIK, i.e. the ymps require a specific version or have some check-current-version-mechanism in the background.

But when fixed, before or after OP caught the TW repos?

Fixed for someone running 12.2? Has anybody seriously tested that?

I think it would probably help if the OP gave a better indication of what led to this error, as the original post implies it was a spontaneous event, not linked to a software install or update. (However the presence of TW repositories would suggest otherwise…)

An indication of the OP’s now preferred route, ie, attempt to restore 12.2, or a fresh install of either current Leap or of Tumbleweed would also help, as further advice could be given if needed.