Luckily I found a 1.9.10-Version in my Download-directory on my Harddrive, everything works fine now again. A little executable in a directory of my choice, thats the way it should be.
Where can I find the old working version? Today I installed, reinstalled, installed and reinstalled over and over again but only get errors, the older versions worked fine. I rather go with a working non-supported one than a new shiny supported broken one.