Datasmith 5.1 3ds max plugin fails to find 3ds max 2016

Just to add to the above, Datasmith 5.0.3 plugin installs fine with 3ds max 2016, but there is no Datasmith tab in the ribbon. I can still export through max’s dialog box, but I cannot use the direct link feature… (I am not sure if the direct link has been added only after 5.0.3?)

Could anyone please confirm Datasmith 5.0.3 is what I am left with, as I do not really want to upgrade 3ds max, at least in the near future…

Many thanks and have a great day everyone