Problems updating to iTunes 10.6.3

Hi

(On Lion 10.7.4 w/Intel 2,2 ghz Core i7).

Trying to upgrade iTunes to 10.6.3. via softwre update.

Message is consistently :

"The update “iTunes” can’t be installed.

The update could not be verified. It may have been corrupted during downloading..."

The software update window has the message : Itunes partially downloade (0%)

I have performed disk and permission repairs without any effekt on the updating prosess.

Any tips to what I can do would be greatly apreciated.

Best regards.