This topic demonstrates how to add a panel addon to Flight Simulator 2004 using Addit! Pro For Flight Simulator 2004 by working step-by-step through the installation of an actual, downloadable third-party addon.
Our panel is called FS2004 Panel--Boeing 737-NG by Marco Spada. Download the 4.6 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 Boeing 737-NG)
or
ByteForge.com (http://www.byteforge.com/products/ap_fs2004/support/walkthroughs/install_panel_addon/b737ng04.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 b737ng04.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, the colored status indicator for the Configure Panel step is red, denoting an issue needing attention. Addit! Pro needs to know the name of the folder you would like to use to store this panel. We will tweak the configuration to address this installation issue. Press Configure Panel:

On the Configure Panel window look for the section "Install the panel files to". Pick "An existing or new panel folder" then press Next:

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

On the Select/Create Panel Folder window, enter "Boeing 737-NG" in the folder box near the bottom as shown below, then press ENTER. We will direct Addit! Pro to store the panel in this folder. Press Select to continue:

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

On the Configure Panel window (positioned to the Set Picture step), press Set Picture and select a picture to represent the panel. 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:

Use Addit! Pro's Edit Aircraft window to assign the panel to the Boeing 737-400. Press the Edit Aircraft button on Addit! Pro's button bar. When the Edit Aircraft window appears, position to the Boeing 737-400. Right click and pick "Change Panel...":

When the Select Panel window appears, locate the Boeing 737-NG panel as shown below and select it. Press Select:

Finally, start Flight Simulator 2004 and select the Boeing 737-400 aircraft and enjoy flying with your new panel!
