You can move the main part where the executable stand (the small 1,4GB part) using Windows Settings->Application and select MSFS->Move, and then you can manually copy the big part (>100GB) where you want; When launching the sim after that, it will believe it have to re-download the big part. Just point where you copied the >100GB part and nothing will be downloaded and all will be good. I learned this the hard way when I misplaced my first loading 