This topic demonstrates how to add scenery to Flight Simulator 2004 using Addit! Pro For Flight Simulator 2004 by working step-by-step through the installation of an actual, downloadable scenery addon.
The scenery addon is called Lismore Regional Airport by John Ross. Download the 4.5 MB zip file to a folder called Addons on your C: drive, if you wish to match-up perfectly with this walkthrough:
Download from:
Flightsim.com (http://www.flightsim.com/
- requires login - search for Lismore Regional Airport)
or
ByteForge.com (http://www.byteforge.com/products/ap_fs2004/support/walkthroughs/install_panel_addon/lismore.zip)
Begin by opening Addit! Pro. Pull down the File menu as shown below then select Install an Addon:

After the Addon Installation Wizard window appears, press Select Addon Files:

When the Select Addon Files window appears, locate lismore.zip (the file you downloaded above). Select only this zip file. Make sure all of the files inside the zip file are selected in the Zip File list, as shown below. Press OK:

Back on the Addon Installation Wizard window, all colored status indicators are either green or yellow so you could press Finish at this point and install the scenery using the default configuration. Instead, we will tweak the configuration to demonstrate how it is done. Press Configure Scenery:

On the Configure Scenery window look for the section "Install the scenery files to". Pick "An existing or new scenery folder". Generally, it is best to install a scenery addon into its own custom folder then update Flight Simulator's scenery library so Flight Simulator picks up the new scenery. That is what we will do here. Press Next:

On the Configure Scenery window (positioned to the Set Installation Folder step), press Change Folder:

On the Select/Create Scenery Folder window, enter "Lismore Regional Airport" in the folder box near the bottom as shown below, then press ENTER. We will direct Addit! Pro to store the scenery in this folder. Press Select to continue:

Back on the Configure Scenery window, notice the Target Folders of the scenery items have changed to reflect the choice you made in the last step. Press Next to continue:

On the Configure Scenery window (positioned to the Update Scenery Library step), select "Add scenery to the scenery library", provide a title, and make sure "Enable the scenery" is checked (these are the default values). Press OK:

Note: applies to Addit! Pro For Flight Simulator 2004, version 6.3 or better.
On the Configure Scenery
window (positioned to the Set Picture step), press Set Picture
and select a picture to represent the airport. Press OK:

Back on the Addon Installation Wizard window, Press Installation Options:

On the Set Installation Options window, enter an addon name. The Quick Picks button provides a handy list of possible names. Optionally, identify the authors and provide a description as shown below. Press OK:

Back on the Addon Installation Wizard window, press Installation Summary:

Tip: maximize this window to see as much information as possible. Everything looks to be in order. Press OK:

On the Addon Installation Wizard window, press Finish to complete the installation:

According to the Installation Results report, all files were correctly installed and a new scenery area was created:

Finally, start Flight Simulator 2004 and visit Lismore Regional Airport (YLIS):
