I have the same trouble only now I cant import anything the program shuts down on anything I try to import. But the skp files never worked for me.
I also have this issue and since I have spent hundreds of hours building 145 sketchup models in the 2016 version and now can't, without rebuilding, backdate these models to sketchup 8 etc. I have just purchased the full, plus extras, of reallusion products not knowing of this issue so someone needs to sort this out as reallusion product is not fit for purpose and requires moneyback...
yess seem 3dxchange eror for skp sketchup 2016 but It works fine with files skp for sketchup 8