Without warning LM changed how airport elevations were prioritized in P3d 4.5 HF2. This eliminated the need for those altitude correction ALT BGL files. fsaerodata  recommends placing your 3rd party airport files at a higher priority than the fsaeordata files to avoid airport elevation issues. If one wants to have the fsaerodata AIRAC apply to all airports, one must run  a utility provided by fsaerodata as documented on their official support forum.
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