WIN CE navgo. trying to update

Hi guys, help needed, i have downloaded iGO 8 for wince but cannot get it to work on my navigo. All that I know is its 400 x 272 screen.
I really don't know what to do to get it to work.
Secondly, I need USA maps for my holidays, I currently have them on my mio software but this is circa 2008 so I want some recent ones and I like iGO