Ideally you would update Carbide Create from v4 to a version which will open said files and re-save them so that they can be opened in v7 and re-saved so that a current version will open them — we have v7 at:
If you need some intermediate version, let us know at support and we’ll try to dig it out.
You’ll need to update to Grbl 1.1 so as to be able to run a current version of Carbide Motion, but the updater hasn’t been available for a while — some folks have managed to compile Grbl w/ the Carbide 3D defaults as described in the header files and re-flash thus on a Shapeoko — there are some specific values for a Nomad, so that may be a bit more complex — please check in w/ the folks at support before trying that route.
The official recommendation for Shapekos is to buy a new controller — not sure if that’s the case for a Nomad (the controller isn’t as easy to get to).