[opensuse] Cannot upgrade to/install 42.3

Hi all, This afternoon - after a lengthy backup process of /home - I tried to upgrade from 42.2. to 42.3. The installer media is an USB stick. Shortly after beginning the process it stuck at the wifi driver, which is iwlwifi. Tried several times, to no avail. Then I tried to install instead of upgrade, with the same result. I downloaded 42.3 with metalink which automatically checks the integrity - at least this said on the page. What else can I do to have 42.3? Thanks, Albert