Amazing that people are still having difficulties with this update.
I was successful last evening.
One can only wonder of the many hours spent in vain by so many people trying all sorts of work-arounds and who have probably made a total mess of their players as a result.
That combined with all the replacements given out needlessly by "Geniuses" who didn't seem to know any better, is truly remarkable.
All this for want of the "Powers That Be" eating a little humble pie, announcing that they had a technical difficulty, that would take a certain time to resolve and asking people not to do anything frantic in the meantime.
Most Apple owners are, by default, reasonable people, but the curtain of secrecy which descended (as usual) following on a relatively trivial matter led to a lot of avoidable panic.
I hope the Top Brass will learn from this adventure, though I doubt it.