Did you read the About section in the wiki? This is the note you get when you order the map
You will receive two emails:
•One email containing a link to a webpage where you can track the status of your request which will be sent immediately.
•One email containing the download location for the Windows BaseCamp/MapSource installer, Mac OSX BaseCamp/RoadTrip installer, Linux package and gmapsupp.img when the server has processed your request.
Did you not get that?
The second email reads:
Hi,
Your request for a Garmin map on garmin.openstreetmap.nl is ready.
The server has generated four different configurations of your map:
* _windows.exe = Installer for Garmin BaseCamp/MapSource (Windows).
* _macosx.zip = Installer for Garmin BaseCamp/RoadTrip (Mac OSX)
* _gmapsupp.zip = Combined image for direct manual placement on the GPS device (gmapsupp.img)
* _tiles.zip = A zip file containing the tiles in the request, especially useful for Linux users (e.g. QLandkarte)
Please browse to the website listed below and download the map configuration(s) you're interested in. Your request will be available on the server for 120 hours before it's deleted.
You need to download the first one to install the map to your Pc for BaseCamp to use.