I got it to work for me.
Using the info below from https://www.avsim.com/forums/topic/491095-airport-chart-viewer-problem/
This is from A32xx
Download Airport Chart Gauge V2 from the library here. It's for FSX and FS2004 but doesn't say so.
Right-click on the installer and set the compatibility mode to XP SP2 and Run As Administrator.
Install as per the on-screen instructions, you MUST install the gauge into at least one aircraft on the installer's list.
When installed, right-click on the Airport Chart DB Builder and set the compatibility mode to XP SP2 and Run As Administrator.
Launch FS2004 [or FSX] and click Fly Now.
Minimize FS2004 [or FSX] and launch Airport Chart DB Builder.
The extra step here, is to check for update, then click "CLR". Continue with the steps below
Select FS2k4 and click Build. Wait forever. When complete, click Off.
Database completed: 1797 airports
Quit FS2004 and re-launch it.
Select your APG equipped plane, choose an airport, click Fly Now.
Open the ACG gauge pop-up window - if your plane has 4 pop-ups, ACG will be no. 5.
There we go :)
