Hello,
Thanks to this forum, I know how to handle maps with Mapsource.
I installed mapsource (latest installed version and also SE portable) on my notebook and put the downloaded maps in c:\garmin
The maps are found with mapsource (SE) and I can transfer them to the SD card.
As some maps are huge and need lot of time to render,transfer..., I also installed mapsource (same version) on my Desktop 64bit.
But here, the desktop ...