How do I download a Simniation aircraft to FS 2004

I am not a computer genius so I need some help.
I have been trying to install a Cascade Airways BAC 1-11 on to FS 2004.
I have read the instructions on how to download the textures and install them along with the BAC 1-11 400 model by David Maltby but still no luck.
Is there anyone that can help me ?
Thanks
I have been trying to install a Cascade Airways BAC 1-11 on to FS 2004.
I have read the instructions on how to download the textures and install them along with the BAC 1-11 400 model by David Maltby but still no luck.
Is there anyone that can help me ?
Thanks