Initializing help system before first use

# Silently Modifying an Existing Installation

You can modify or remove an installed instance of Xpress Insight by running the installer in the usual interactive way.

The equivalent silent operation will not modify what elements are included unless `ADDLOCAL` or `REMOVE` are used, in which case the elements will be added or removed as directed.

No error is generated if you add an element that is already present, or remove one that is already absent; no action is taken in either case.

As in new installations, `ADDLOCAL` can use the special value ALL to ensure that all elements (except those optionally specified by `REMOVE`) are installed. Silent installations and silent modifications are invoked in the same way.

Parent Topic Advanced Windows Installer Options

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