Here is what the developer say's about installing the patch as I told you under bobr2:
Instructions for FlightZone 02 Portland for FSX Patch
by Larry Robbins
Please follow the instructions carefully to properly install the patch and to have FZ02 Portland to function properly in FSX. You MUST have an original copy of FlightZone 02 Portland to install on your computer. I have created a FSX Patch that contains new airport configurations, exclusions, and replacement FSX trees that will improve the look and feel of FZ02 Portland in FSX. Visit www.myflightsimblog.com for more detailed instructions.
Sorry part of it did not show up the Disclaimer: DISCLAIMER: First of all, let me be clear with you up front. I am in no way providing you with any part of the original FLIGHTZONE 02: PORTLAND scenery or Orbx addon scenery. YOU MUST ALREADY OWN AND HAVE INSTALLED THE SCENERY PACKAGE ON YOUR SYSTEM. I will, however, show you how to convert you own personal copy of FLIGHTZONE 02: PORTLAND for FS9 into a usable format that will work and look great in FSX.