Yes. I cleared 165 gb of space in the solid state C drive and the installer suggested the C drive. As I understand it the program will refuse to install on either a machine that isn't sufficient spec, or into an area with insufficient room. After it accepted the authentication it then told me I can download MSFS now, but not to the C drive as there was insufficient space. It suggested the E drive.
The point is, the program loaded and is in the C drive. I know its there, because there is 110 gb more in there than when I started, but I can't see it or access it.
I can believe, having downloaded the 110 gb or so of program I need to download a further 107 gb. That makes close to 220 gb of space needed for the program.