Hi,
I figure it out. Setup.exe accepts the parameter "/s" for a silent install. One can pass a destination log file, to log any error during the install.
setup.exe /s file_to_log.log
However, the silent install could not be absolutly silent, because sometimes you can get a warning message (like that the file being copied is older than the file you already have in disk). For this I change setup1.exe, and get off this message, writing in the log file that this situation had occur.
Thank you