Thank you for your comments!
I only have 40 - 60 MBit/s and have been trying to download about ten times the latest update since it came out. I always get stuck at the same place (59% of downloadinf microsoft-airport-lsza-lugano-0.9.2.fspackage.002" or 9% of total (2,03GiB / 23,52GiB). Don´t you rather think this is an error of the downloading procedure?