Actual Installer Help \ Custom Variables
On the System \ Variables page you can specify custom variables for using during the installation process. Values are retrieved from the Registry at the setup beginning.
The name of the variable. Must be surrounded by symbols < and >
The bitness of the Windows Registry. It is recommended to set it to Default.
The path to the registry key. Short paths are supported. Leave this field blank to assign Default Data to the variable.
The name of the registry value.
The type of the registry value.
If the registry key or value doesn't exist, this data will be assigned to the variable.
Also it is possible to show some message or terminate the installation process when the registry key or value doesn't exist. Read more...