Ovi store always takes you to that page when you attempt a download... It should auto-populate the information though once you get there.
Go to "Options" from the browsers title bar.
Click "Add-ons".
Pick the "extensions" tab on the page that opens. Highlight "Single sign on for Ovi by Nokia".
Select "Find Updates" at the bottom of that page.

There should be an update from version 1.0.2-1 to version 1.5.11.2 available.
Select "Install Updates" and see if this helps.