First of all,In your Cascade Airways BAC 1-11 Texture Download,you should have a folder called "Texture",right click on the "Texture" folder,and then select "copy",don't do anything else yet.
Now open your BAC 1-11 400 model by David Maltby File you just downloaded,now there should be one folder called something like "BAC 1-11",it'll most likely have a different name,but I'm just using that name as an example,double click that folder and inside you should find folders called Model,Sound,Panel,Aircraft.cfg,Air File.
Now remember when we copied the BAC Cascade Airways Texture folder,Simply right click inside the folder "BAC 1-11 400 by David Maltby",where we have our Model,Sound,Panel,Aircraft.cfg,Air file.
folders,and select paste,now inside your BAC 1-11 400 model by David Maltby you should have these folders,Texture,Sound,Model,Panel,Aircraft.cfg,air file.
Now close the BAC 1-11 400 model by David Maltby folder,and extract it to a folder on the Desktop preferably "Temporary Downloads"
simply drag and drop the BAC 1-11 400 model by David Maltby folder from Temporary Downloads into your FS2004 Aircraft folder at C:/Program Files/Microsoft Games/Flight Simulator 9/Aircraft.
Hope it helps.
