Upgrading

Hi,
I downloaded the update and overwrite the existing script files etc with my current db. I got a pop up when it opened them, and now I'm getting some strange behaviour when creating a new release.
I can create one, but if I select another one and then try and reselect the new one nothing happens in the detail window.

Possibly something screwed on the import of older db.

What is the correct procedure to open my old version db in the new version just released?

ty, sv