First, @brogers_1 - Thanks for the link to the video. Perfect!
Second, WTF!?! Really?
From the on-line documentation for the Customization Wizard...
1. Click the folder icon to the right of the Locate Installer field.
2. Navigate to the installer and click it.
Good grief... >.<
And in case the video disappears in the future you have to select the installer created by Creative Cloud, open the package contents (right-click), and go to Contents > Resources > Setup > APRO15.0 > Acrobat DC and select the Acrobat DC Installer.pkg. Then replace it with the new one the Customization Wizard creates. A little more involved than "Navigate to the installer and click it."