BN Islander for FS2004
Download from m-r-software.  You will need the version in difln32g.zip. You will also need BN32Rest.zip for some gauges and sounds and BN32Snd2.zip for the prop sounds.
There is an install program but it didnt seem to work for me so I manually installed as well. (as at 11/ 06, no doubt it will change over time)
Put the dynamic load library (*.dll) for virtual basic in Windows/system.
Put the two folders BN-2 Panel and BN-2B-3 in your aircraft folder.
You then need the Loganair repaint (Mark Beaumont's loganbn.zip from Simvation) put its files into the BN-2B-3 folder.
Then edit the aircraft.cfg file (after saving copy as aircraftold.cfg) to add the contents of  gbldv.ini like this:-

[fltsim 0]
existing text for original aircraft
[fltsim 1]   <---type this in (each additional paint-job is numbered sequentially)
<---- paste in the text from gbldv.ini here

there is more existing text as follows:-
;##################################################################################

[electrical]........................
 
 
 

It should then follow this format:-

[fltsim.0]
title=
sim=
<snipped>.
.......atc_heavy=0
[fltsim.1]
title=
sim=
<snipped>
......atc_heavy=0

;##################################################################################

[electrical]
;BusType.....................