I downloaded Adobe Air 3.5 from the official site and I can't create a silent installer using Sfxmaker. With some programs I can create a silent installation, with others not, what might be the problem?
The correct string that needs to follow the install path is -silent. You will need to build your package and provide that string along with the setup package. For example: setup -silent. Please notice that you will need the full Adobe Air installation package for the -silent option to work properly.