Hoooray!
The Photoshop 2014 installation idea works well. When running it the first time they asked me if I want to keep the old preferences and I said no, because many of you considered the preference issue as important.
It is a bit strange because I now have two versions of Photoshop CC. Can I delete the older version?
I would like to mark one of your answers as correct, but they are all correct so I do not, but the problem is solved for now!
The magic of chance came to the artist and he/she had not to go deeper into technology issues
Many thanks to all of you,
Stefanie