This is a v7 3DM file, bt MOI only supports v5

 From:  Michael Gibson
10388.6 In reply to 10388.4 
Mac version here:
https://moi3d.com/download/Convert3DMToRhinoV5_mac.zip

Converts a Rhino v6 or v7 .3dm file into a Rhino v5 .3dm file that MoI can load.

- Michael