I got your advise wrong, thought it was an app to speed up the download of jmermels stuff.
But after a while I looked at it again and understood the purpose of the downloader.
So I ran it on an winbased pc and got all the maps I needed without problems and much faster then the files jmermel is pointing at.
Thank you very much.
One question remains.
Do we need a new downloader every time there is a new Sygic version or can I update the maps also later this year again?