did you give them everything as asked / requested, reports error messages, have the latest version etc etc, without full reports and everything as asked for, sometimes its only guesswork without all the extra bits needed for a solution, up to date drivers, or odd or unknown programs running or ...

There are no support, if your game isnt working

I bought Mater of magic, with the Caster of Magic DLC for both Windows and DOS.
But I don’t have sound effects in the Windows version of Caster of Magic, only music.

I tested with the DOS version and it have both sound effects and music.

I found ...