The Wix Candle installer action has a known bug in it. The -pedantic switch bug. I notice there is a FBWixInstallToolkit.fbapx in the ActionDefs folder. Is it possible to either get an updated Wix action for FB4 or the password to the fbapx so I can take a look at fixing it myself.
This is not a bug in the action, it’s just that the WiX toolkit has changed since FinalBuilder 4 was released and is no longer compatible with the action. You will either need to use an older version of WiX, use the ‘Run Program’ action or upgrade to the latest version of FinalBuilder.