I am working on SAP GUI 7.40 installation.
One way to do my task is to execute this directly from the media:
NwSapSetup.exe /product=SAPGUI /nodlg
(usually in folder PRES1\GUI\WINDOWS\WIN32\Setup)
It installs only the first check, and you see only the progress bar.
Works like a Charm!
Now I try to do the self extracing exe file.
It is easy, but I will write later....
Regards
Ilian