Using .GPX files with Google Earth doesn't require an upgrade. I haven't upgraded yet, and am using it with my Pocket Query .GPX files. Just drag a .GPX file onto the app, and voila!, they're all loaded.
If you want to download waypoints and tracks directly from your GPSr, then an upgrade is required.
or use mapsource to export it all into a gpx and google earth will have it...No need for any $$$............Errrr this was probablly allready covered....I'm slow