Yes, MVCPlanes2OFS.exe works correctly only if the MVC stream contains the original 3D-Planes. Unfortunately, they are destroyed when the video is re-encoded, so you should always use it with an unmodified 3D BD (or an original 3D BD ripped with MakeMKV).
Remuxed 3D BDs (without re-encoding, for example to add the Atmos audio or new subtitle tracks) should still contain the 3D-Planes, but they are often badly assigned to the wrong subtitle streams, and therefore they give bad 3D depth values for a specific stream. But MVCPlanes2OFS should be able to retrieve the OFS planes from a remuxed 3D BD anyway.
Note also that many cheap Asian movies do not have 3D-Planes at all, or they have bad 3D-Planes with a single fixed depth value only.
Downloaded material is often badly re-encoded, or remuxed at best, and you should avoid it like the plague. Furthermore, it's a copyright infringement, prohibited by the Doom 9 rules.
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