So do you see the Custodian manager in the list?
If yes, I think you right click custodian manager and choose properties. Scroll down to the bottom and you should have the option to upgrade. If that isn't it, just highlight Custodian Manager and scroll to the bottom of the page, is the upgrade option there?
I am going off memory here so my apologizes for not having the exact step by step. :)
is this EV 8, btw?