And with less options Aslain have less lines of code to verify, he can fix the problems in less time, it takes less time to upload for servers, ....
And yes the preview images and sounds are about 40MB, 40% of installer: http://s1.postimg.org/hpdltyc27/Sem_T_tulo.jpg
It's only a suggestion. And you have 2 options: - use 2 different .exe with/without previews
- verify what options are really necessary on MOD, and remove the others.