I have both FSX, (the day it was released), and FS 2004 installed on my Hard Drive.
Until I am prepared to spend loads of money on a complete Hardware upgrade to suit FSX, I will still be enjoying FS 2004 using maximum graphical settings, for the foreseeable future ...

...!
F...G-BPLF... 8-)...!
(Many of my accumulated FS 2004 Payware/Freeware Scenery Design programs, etc, are not suitable for FSX!).
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.