Not too sure whats going on with the database on the site to be honest mate, its confused me too, you normally just copy the OVP and BMP files to the map folder however there seems to be a lot of them in the DB which has confused me too havent updated my DB in a while... Just copy them all from the Consolidated folder to your map folder
If you only want one category for all cameras then use the single file, if you preffer different warnings and categories for each of the types of cameras around use the TomTom Zoned