P3Dv4.3. Order number for KIAH is #STxxxxx, file version 2.0.1.0. Recently, I updated the FSDT Live Update and noticed that KIAH reverted to and is stuck in the trial mode, despite the Addon Manager showing the scenery as "Product installed and active".
As the scenery loads, I get the following: "The Addon <unknown> is causing the Couatl Scripting Engine to restart. Please download and install the latest stand-alone addon manager from <FSDT website>.
I uninstalled the KIAH scenery, restarted my cmpter, installed the original Addon Manager, which seems to update to the latest version automatically.