So this is how to fix:
download the update from:
http://www.dfiles.de/download/d3/utilit ... Update.zip
or
http://www.docheckor.de/vortex/Vortex-Update.zip
or
http://www.descentforum.de/download/Vortex-Update.zip
and extract the file into your existing vortex-folder.
IF YOU HAVE DONE IT RIGHT: You will be asked if you want to overwrite the existing Vortex.exe . CONFIRM

good luck and best regards
PS.: At this moment no Update can be done to the Vortex-Website. Sorry bout that...
Do_Checkor aka Martin