My app can’t read GPX tracks or routes
Some navigation apps only support Routes. Others only support Tracks. If your navigation app doesn’t work out you can give one of the recommended apps such as Osmand a try.
If your navigation does not support routes you can still make use of the bought GPX routes by pairing the Points of Interest file with your free track download.
My app says the file is corrupt or unreadable
Try downloading a new copy of your track or route. Also make sure the app you’re using does actually support GPX files and not just it’s own variant of it.
Often this kind of error is used as a generic error for incompatibility issues too. It doesn’t necessarily mean the file is wrong or broken. Contact the apps developer and see if the track or route should be compatible. Try a different app if the issue persists.