InstallShield 2012 Express Edition User Guide - Knowledge Base ...

Chapter 6: Creating Installations
Before You Begin
• If Required Execution Level is set to Invoker, your installation includes setup prerequisites that
require administrative privileges, and Require Administrative Privileges in the General Information
view is set to No, end users should see one UAC prompt—plus up to one additional UAC prompt for
each reboot—during installation.
• If the full user interface of the setup launcher is displayed and the installation includes setup
prerequisites that need to be installed, the setup launcher typically displays the setup prerequisite
dialog before the main installation starts. If one or more of the setup prerequisites that need to be
installed require administrative privileges, the Install button on the message box has the shield icon
to alert the end user that elevated privileges are required.
• If the installation is continuing after a reboot and privileges must be elevated, the OK button of the
continuation message box has the shield icon. If privileges do not need to be elevated, the shield
button is not displayed.
• If your installation includes more than one setup prerequisite that must be installed on a target
machine and one or more of those setup prerequisites requires administrative privileges, the UAC
prompt is displayed before the first setup prerequisite is installed. This may allow elevated privileges
to be used for all prerequisites without requiring separate UAC prompts for each prerequisite
installation. Note, however, that if a setup prerequisite installation causes a reboot, administrative
privileges are lost, and a UAC prompt may be displayed if any of the remaining prerequisites require
administrative privileges.
• If your installation includes more than one setup prerequisite that must be installed on a target
machine and one or more of those setup prerequisites requires administrative privileges, the UAC
prompt is displayed before the first setup prerequisite is installed. This may allow elevated privileges
to be used for all prerequisites without requiring separate UAC prompts for each prerequisite
installation. Note, however, that if a setup prerequisite installation causes a reboot, administrative
privileges are lost, and a UAC prompt may be displayed if any of the remaining prerequisites require
administrative privileges.
A slightly different behavior applies to feature prerequisites. If your installation is going to install
any features that are associated with prerequisites, the UAC prompt is displayed when the
ISInstallPrerequisites custom action relaunches Setup.exe in feature prerequisite installation mode.
This occurs regardless of whether any of the feature prerequisites require elevated privileges. It also
occurs before any of the feature prerequisites’ conditions are evaluated to determine whether the
feature prerequisites need to be installed. Note that if a feature prerequisite installation causes a
reboot, administrative privileges are lost. After the reboot, the ReadyToInstall dialog is displayed
again, and the end user needs to click the Install button to proceed with the rest of the installation.
In this case, the UAC prompt is displayed again when the ISInstallPrerequisites custom action
relaunches Setup.exe in feature prerequisite installation mode.
• Note that if Require Administrative Privileges in the General Information view is set to No but your
.msi package tries to perform a task for which it does not have adequate privileges, Windows
Installer may display a run-time error.
• If privileges are elevated at the end of an installation and the Setup Complete Success dialog
launches the product, elevated privileges are carried over to your product. In most cases, running an
application with elevated privileges is discouraged.
InstallShield 2012 Express Edition User Guide ISE-1800-UG01 131