Reference/SilentInstall
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SilentInstall
normal|silent|silentlog
Specifies whether or not the installer should be silent. If it is 'silent' or 'silentlog', all sections that have the SF_SELECTED flag are installed quietly (you can set this flag using SectionSetFlags), with no screen output from the installer itself (the script can still display whatever it wants, use MessageBox's /SD to specify a default for silent installers). Note that if this is set to 'normal' and the user runs the installer with /S (case sensitive) on the command line, it will behave as if SilentInstall] 'silent' was used.
Note: see also LogSet.
