I was wondering what are the applications in C:\Program Files\InstallShield\2012Spring\System do and which are useful for debugging installations that are failing?
Most of the functionality, such as InstallScript debugging and processing MSI log files, is available from InstallShield menu items, so you shouldn't have to launch anything from the InstallShield System folder. The main exception that comes to mind is debugging InstallScript on a test machine, as described in the help topic "Debugging an Installation on Any Computer".
