I downloaded Astyle from here: https://sourceforge.net/projects/astyle/files/
When I execute Astyle.exe in \bin a command prompt opens which looks like this:

I can't execute any commands. Astlye.exe seems to be stuck. I've read the documentation for Quick Start and simple commands multiple times, but could not find my error, so I think, I`m overlooking something obvious.
I realize, there have been similare questions, but none of them could solve my problem.
EDIT: I also rebuild the Astyle.exe. Same problem as before.
The default for most linux-based tools is to read from the standard input if no file is specified (so that one can "pipe" into it).
What you are seeing is simply
astylewaiting for input. If you specify a file on the command-line or the--helpflag, you'll see more useful information.