Redirecting a Form to a Private Page

I have set up a Gravity Forms form on a page which is to allow a person to request some free information. The form should direct the person to another page on the site that has three possible informational pieces for download. This secondary page is also a Gravity Form and it should be a private page so that it is not viewed in the usual navigational menu structure but only when requesting a piece of "free" literature to download.

I am using the Studio Press WP theme, Genesis - Streamline (Child). I am able to make the second page a private page so that it is only viewed when a free piece of lit is requested. However, when I edit the form to use "confirmation" by page, the private page is not listed under "page" options to redirect.

To correct this, I made the confirmation page a public page but by doing so it appears in the main navigational structure, on view to anyone. (As it is right now.)

I tried to use "redirect" and put in the private secondary page address (with the form to select a particualar "free" piece of lit) but that causes a 404 error.

Website: http://www.afullyengagedlife.com

Question: Can Gravity Forms not see and list private pages as "confirmation" choices under "page"?
Question: Why wouldn't the redirect to another page on the site work?

Is there a fix to this?

Could this be a theme issue instead?

Thank you!!

Yes. I can't see on the drop down for a "page" confirmation message selection, a private page. No private pages are listed for selection.

If I choose instead to use the "redirect" confirmation message option and type in the URL, a 404 is returned.