Re: Worldwide routable Garmin maps: URL REMOVED

Please advise. Sorry if you need to explain this over and over again to novices like me.
I have just downloaded some European maps with the installer for Windows. The installer apparently unzipped itself into a bunch of IMG files. I have no idea what to do with them next to make them work. My Garmin Nuvi has a micro SD card; I copied the files there into Garmin directory, but, not very surprisingly, it was not sufficient to show the maps. Now I'm stuck. Is there some instruction on how to make these maps work? Could you please point to it?
Thanks.