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You don't. I just followed the way it was described in the link. The ran MSFS and all was well. IMPORTANT: In the General Settings of MSFS be sure to turn the mod on.

Problem solved using trick mentioned in another post. I converted the sim installation to modern instead of legacy before trying to move as per: https://parallel42.com/blogs/wiki/converting-my-sim-install-from-legacy-to-modern I have a Dell laptop with a RTX 3060 Nvida graphics card. With the mod on, under identical settings, my frame rate has doubled! Amazing

I too can't copy the files into the protected installation directory.