The two EZ/RWY 12 library files below must be on your system.
Instant Scenery version 2.0 build 14
Copyright (C) 2007-2010 Flight One Software Inc.
Copyright (C) 2007-2010 Konstantin Kukushkin
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Download Ez/RWY12 objects if you do not already have:
Airport_Buildings_01_AP.bgl
AB_Buildings.bgl
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Place the scenery & texture folders into your addon scenery folder.
I place mine in my addon scenery/western USA folder.