Hi Psygorn,

re:
> Is it possible to use 123D as a companion to MOI for fillets?

Yes, I think you can transfer back and forth to it using STEP format.


> Does the below link have the latest version of it? is it version 2.2.14 ?

Sorry, don't know.


> What software (preferably free & light weight) you suggest to be used as a companion for fillets?

You might try ViaCAD, OnShape, or Fusion360.

- Michael