Yes, like this?
Your last screenshot shows your initial report of having both menus available wasn't accurate. You are missing the Couatl menu, so the scenery won't work.
the thread named "Addon Manager not showing up in P3Dv4 **SOLVED**" thread lists all the known solutions for missing menu entries from the "Addons" menu:
http://www.fsdreamteam.com/forum/index.php/topic,17484.msg122656.html#msg122656Even if the title says P3D4, the solutions are valid for FSX as well.