Had the same problem. Download all the 2020 SDK and Python Bindings didn't worked out for me. But after I installed the 2019.5 SDK (Clang) and 2019.5 Python Bindings, I was able to get it running. Works now with 2020 as well as older FBX Version files.
Did also install the USDPython 0.64 SDK in advance, but not sure if this is even relevant.
The only thing I still have problem with is the right mapping of the UV. Importing FBX with textures does not map them right like it did in the 3D modelling software. Removing and adding a texture manually in Reality Composer fixes the mapping for the UV. Must be an error while converting FBX to USDZ.
MacBook Pro, Late 2013, Mac OS 11.2.3
Poigel
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