FSX_St_Helena_Ascension_Tristan-da-Cunha.zip > Put in Scenery-World-Scenery > Readme.txt
 
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Copy the "FHAW_ADEX_CS_ALT.bgl" file from the "Put in Scenery-World-Scenery" folder to the FSX "Scenery\World\Scenery" folder.  This corrects the altitude for FHAW.