Registry repair tool if you have installed more than 1 time and have troubles

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If you have installed before, and especially if you have installed add-ons - its entirely possible some registry entry did not get completely removed. This can block re-installing or make the re-install fail.

If this sounds familiar, and you get stuck you could try using the FSX Registry repair tool from Flight 1.
https://www.flight1.com/view.asp?page=library