Deleted everything that had "KDE4" in its name, via YaST.
Tried then to install everything that had "KDE4.1" in its name; the answer was : nothing.
Tried to reinstall KDE4 : got a lot of YaST messages telling me that something is missing and leaving only one option open for each of the 80 packages or do : do not install (to click one by one, which promised to be a rather long task).
So I aborted YaST operation and am back to KDE3.5, and I suppose I shall have to stick to it for a while
