I don’t really understand your topic title regarding what you then put up as an issue in your post. I can only guess that you generally feel “unsecure” using your computer and taking care for your internet plan.
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MSFS currently takes about 136 GB on my drive, so any value near that amount is a realistic size for redownloading MSFS with all updates. If you also purchased addons, the size will increase further.
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When your C drive (containing your OS) has only 500 GB, you might want to put all your big applications elsewhere, so your windows installations always has space left “to breathe”. Yet if you still install on C, there shouldn’t be any problem either, since installing applications is what a drive is good for.
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It doesn’t matter where you install MSFS, the initial suggestion to install it on your C drive is common for all kinds of installations from various manufacturers.
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It doesn’t really matter for MSFS wether you put addons in some separate folder or even on a separate drive, as MSFS will just read out the resulting path to the folder of installed addons and access these addons from there.
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If you don’t know if your OS failure was caused by MSFS, what brings up the idea there could be any connection between your OS failure and the installation of MSFS in the first place? Since there was a time gap of 2 weeks, how would one see a connection there? Let’s assume it was caused by the installation MSFS 2 weeks before, how should anybody see any chance to determine the exact problem after all went well for 2 weeks ?
Btw I couldn’t follow: why did you do 2 installs and uninstalls?
What exactly do you mean with “OS failure”?
And how does a data plan warning from your ISP have anything to do with MSFS besides that the download of the MSFS installation and even afterwards the download stream of scenery data does naturally consume data and therefore contributes to your data plan depletion?