Determine if the Custom Action Function is Exported
Another reason a custom action may not run is because the custom action function isn't exported. This may not be common in most patch build systems, but could arise during authoring or if a binary wasn't updated in the Binary table. You should expect to find a log line similar to the following.MSI (s) (1C:C4) [16:57:23:258]: Doing action: CA_QuietE...