Garmin express fails to dowload purchased map to sd-card

Hi

I just bought a maritime map covering Northern Europe. Garmin Express for Windows fails when I am downloading the charts to the SD Card. Wheni he progress bar reach around 80 %, I get an errormessage saying that there was an error when the chart was downloaded. I have tried the same using different SD-cards and different PCs - all with same result. Download of software updates for my Garmin Network works fine.

Any suggestions?

Best regards

Chr B