Hi Guenter. First of all, sorry for my delayed answer. It's vacation time
I am glad the problem got resolved. AmiKit X installs the newest Microsoft Visual Studio. On some computers the automatic install doesn't work and the Studio needs to be re-installed manually - like you did.
Regarding DOpus vs Workbench, you can always switch to Workbench (and back) with MorhpeuZ tool (located in task bar or just press right-mouse button and select AmiKit > MorpheuZ). In MorpheuZ select "Desktop Replacement" and choose DOpus or Workbench.
But as far as I know DOpus can also sort icons by name.