what do you do when your update wont update?

I have cubase 5.1.1 and I’m trying to update it to 5.5.0.
I ran the update, but it doesn’t seem to upload into cuabse.
So is there any suggestions?

If you really have Cubase 5.1.1, you should maybe post in the Cubase forum, if you have Cubase LE 5.1.1, then there is noe 5.5.0 update, and you´re probably simply trying to apply an update to a software you don´t have.