Hey, after I built my game - let's say in PC, I will get 2 files.. how can I later put em togheter or something so I can send them to my friends and they gotta install it?
As Loudmask said. Google 'Bytessence installer maker'.
Unity cannot make installers. This requires a separate program to create an installer. Google it. I'm sure there's a trial for an installer making program.
You need pack your game into setup file using this application