When you have downloaded a download, if you'll pardon the expression, how do you get it into the game? (FS 2004) and please don't say things like "unzip the aircraft zip file to your FS 2004 root folder" - just sounds double dutch to me. I am about 100 levels below that!!!!!!!!!!! I'd be very grateful if someone could offer some EASY TO FOLLOW advice thanks.
have you tried this
Do a Google search for addit pro and download that( it is free for the first thirty days so when the time is up then re-download it), install it and then it's pretty self explanatory from there(I figured it out and i'm a trainee!)
If I understand your question, what you need is
FlightSim Manager 2.4.0 Compatible with both FS2002 and FS2004.
I found this tool very helpful