Thank you. I had to deinstall the whole software before installing and chose the English (not German) Version. Then it worked for me.
I totally agree with the newer versions. But unfortunately I cannot use my older registration key with them.
Thank you for the link. I tried the 7.50 version, but everytime I install it he installs the newest version (8.51).. unfortunately 3.8 is my latest version before that when I try to downgrade via Windows programmes.