Im using Windows 10 - 64. Nothing appears in task managers, the mouse cursor becomes the little "loading wheel" but nothings happens, no black windows, no error just nothing.you might want to give more info, which version are you having problems with, what operating system are you using, Describe what you see, ie does a blank window open? does anything show in task manager etc
maybe check your directory structure, I had this kind of issue when I had #'s and @'s in folder titles, maybe try running it in a root folder. Other than that I don't think I've had any issues getting renpy to start.
I can't imagine why you would think copying another Games "game" folder would help
I tried downloading the full and compressed version and the same happens, older versions worked tough.
The Game folder thingy is a solution i read in this tread, to copy another game, delete the contents of "game" folder and copy this game folder in it. And it worked! it opened, but 2 sconds latter i have an infinite errors of Renpy and cant play.
What i noticed is that there is not a renpy or lib folder in the besides the game folder, is that normal? Even so copying those folders from another game does not work either.