Can't update NAV2011 to NAV 2012 - Help

Hi everyone, This is urgent… I have NAV2011 installed on my computer with just 19 days subscription left. I’m trying to install the latest NAV2012, but I’ve been trying for hours now and I still don’t seem to be getting anywhere. I log into my account and click on the ‘UPDATE’ button. That takes me to a blank page that eventually says ‘The connection has timed out’. I get this all the time. Can anyone help me?