Hey there! I'm not sure if I'll be able to solve your problem, but here's a few things that may be useful:

• You say you're only having trouble with the butler itself, and not gui-butler. However, this app uses the same program under the hood. Are you able to successfully upload a game via gui-butler? If so, that would imply butler itself is actually working on your machine, and you may just be confused about how to use it.
• You say "nothing happens when I try to launch it": by "launch", do you mean you are trying to run butler.exe directly via windows (e.g. by double-clicking it from the file explorer)? If so, then that is the problem: since butler is a command line tool, not an app with a GUI, doing that would just briefly open a terminal and then immediately close it after it finished printing the help info. butler's documentation explains how to use it as a command line tool, but it does assume a level of familiarity with command lines; if you aren't familiar with them, gui-butler may actually be better for your use case.
• If you are using butler as a command line tool already, you'd need to provide more info on what "nothing happens" means here. e.g. are you getting a "command not found" error, are you getting an error from butler itself, is the terminal hanging without printing anything, etc? Including the specific command you ran, where you ran it, and the output of running it are all potentially important pieces of info that would help figure out the problem.

I'm not involved at all in the development of the command line tool, so if you haven't solved your problem going through these you may have better luck contacting itch support (butler is an official itch program, and this is just a third-party wrapper). If you purchased this app thinking it would help but it didn't, I believe you can also request a refund via itch's support.

Hope this helps!