Remember to get the mesh "bgl" file from the link above. A revised download will be forthcoming, I sent Rami a PM asking about the best way to update the current file. In the meantime, the "Island Elevation.bgl" file should be placed either in the folder that was in this download (and inside the scenery folder as well) or placed into the main FSX-Addon Scenery-Scenery folder. . .either way will work, it's just that if it's in the "Marshall_Is_Mesh" folder, it will have to be activated in the scenery library (must be lower than the scenery itself).
I feel compelled, because of this mess, to be sure everyone understands about the folder for the mesh, you'd be surprised how many interpretations there can be when I say it needs to be inside the folder and inside the scenery folder. If you've done a lot of this you know how the folder structure goes. . .if not, the Marshall_Is_Mesh folder must have a "scenery" folder inside it. . .and the bgl file goes inside that folder. Long winded I know but necessary based on e-mails I've gotten from folks who downloaded my previous sceneries and asked if they were supposed to replace the "photo01.bgl" file because all the sceneries had the same file name and wouldn't they all look the same.
I'll get the replacement zip file uploaded as quickly as I hear from Rami. Thanks for your patience and sorry for the mix-up.