I know it’s a bit late now 6 is here but this might be of help to any one updating to studio5.5.3!
I had trouble getting the update to run and tried the windows fix it program from microsoft as susgested
by the cubase help page, but it could’nt find cubase on my computer so could’nt help. Finally got over the problem by inserting my original install dvd and in effect re-installing
studio! Update went in straight away. Pete