Command line switches for ERUNT and NTREGOPT Setup
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/silent
  Silent operation without user interaction

/verysilent
  Silent operation without user interaction and without displaying the
  installation progress window

Note that in silent mode Setup only creates the start menu folder, not
any desktop or Quick Launch icons.

/dir="x:\folder name"
  Overrides the default folder name displayed on the Select
  Destination Location wizard page or used to install the program into
  in silent mode. A fully qualified path name must be specified.

/group="folder name"
  Overrides the default start menu folder name displayed on the Select
  Start Menu Folder wizard page or used in silent mode.

/nocancel
  Prevents the user from cancelling during the installation process
  by disabling the "Cancel" button and ignoring clicks on the "Close"
  button. Useful along with /silent or /verysilent.

/lang=en
  Suppresses the Select Language dialog and installs the program in
  English.

/lang=de
  Suppresses the Select Language dialog and installs the program in
  German.

In silent mode Setup will install the German version of the program if
the operating system language is German, and the English version if
the operating system is in any other language. Use the /lang switch to
override autodetection and install the program in the specified
language.

/nostartupentry (ERUNT Setup only)
  Prevents Setup from creating a Startup folder entry for ERUNT
  AutoBackup in silent mode. This switch has no effect in normal mode.