Of course you don't have to "looking all over forums and the internet" but, obviously, since your request is related to an order, the most obvious place to get immediate support, is by email.
Checking your order status, it shows you purchased GSX a while ago, activated it successfully, then activated it again recently, and then you deactivated it twice, yesterday and today.
Deactivating is correct if you planned to change your hardware but of course, if you deactivate, you will then have to reactivate again, on the new PC (or on the new Windows installation). Right now, the product is not active, because you Deactivated both your activations so, it's all normal.
Just activate the product in the same way you always had: by using the "Register Serial" function of the Addon Manager menu inside FSX, insert your Serial Number, let it activate, and restart FSX.