Didn't it come with any instructions, in the included; "readme" file?...

...!
I downloaded it some time ago, and easily installed it, and it automatically appears in my FS 2004 each time I require it, (Shift+F12 I think).
Paul...FS 2004...(and FSX)... 8-)...!
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.