This tab of the NSIS action specifies additional options.

 

Code to execute: Execute the code you specify.  Enter the code in the edit and click Insert to add to the list.  Select an item in the list and click Delete to remove it from the list.

 

Additional command-line options: Use this field to enter any additional command-line flags to be passed to the NSIS command-line compiler (optional).

 

NSIS compiler executable filename: Use this field to specify the NSIS compiler executable if the action is unable to locate it or multiple versions are installed (optional).  If not specified, the executable is located automatically.