Will these planes work if I install the update FS91?

The patch will not interfere with aircraft but some pay-ware (Active-Camera) need to be patched.
As long as you follow the directions carefully it should be successful.
Good luck.

Thanks, and I just downloaded the "MiG-31 Firefox for FS2002/FS2004" and I put everything in the correct folder and when I went to play it, the plane DOESNT show the Blue/Red thrust comming out the back like it did in the picture?

Can anyone help me?

Unzip it again and put the effects into the main effect folder.
If I remember correctly (It's been a while) the "/" forward slash did the effects, yes no?
Or was it "O" or "L".

http://www.simviation.com/fs2004military1.htm

I have a bunch of XML documents and stuff, would those be effects? Also so do you mean "D:\Flight Sim 2004\Effects" Putting my effects in the main Flight Sim folder?

Effects usually end in "FX" and they are in a separate folder of the zip.
Yes they go into the main effects folder-c/MS Games/Flight Sim/Effects.

c/happens to be my h/d letter.

XML doc's are just for reading not loading.

Alright got it working, thanks

Hey does anyone play Multiplayer? It seems dead to me.. Or do I need to download FS91, for the rooms to show?

I wanna test out my MiG for you guys.