Hi Chris,
thank you for your answers. I have downloaded "Visual Cobol for Visual Studio Personal Edition v.2.2 0".
It runs on Window 8.1 64 bit (Pentium x64). I do not have a web server on the machine so I tried only with Cobol Desktop:
Create > New Project > Cobol Managed > desktop application > debug
and I get
Unable to start program 'c:\....'
Operation not supported. Unknown error: 0x80040d10.
If I launch the program without debugging it start normally.
I have tried with a desktop Cobol Native Application setting a break point. Debug functions correctly.