The problem is resolved:
At installation-time I dont see the option-field for the installation place. Now Opera is saved on D:\ . The Path for 'profile' and 'Cache' file are assigned with the the MKLINK-Command:
mklink /J "C:\Users\Peter\AppData*Roaming*\Opera Software*Opera Stable*" "D:\OperaProfil*Opera Stable*"
mklink /J "C:\Users\Peter\AppData*Local*\Opera Software*Opera Stable*" "D:\OperaCache*Opera Stable*"

And Opera is the default browser.

Thanks to all for your teamwork.

MT Otti22
Bye Bye