Barty,
Another way you can safely update your arcgisbinding version is using our setup tool in ArcGIS Pro.
Projects --> Options --> Geoprocessing --> R-ArcGIS Support Tab. There you can pick the version of R you want to use and click on the arrow that will either display "Update package from the internet" or "Install package from the internet" depending on whether you have a pre-existing version of arcgisbinding.
If you are updating, I recommend it now because we just released v244, please make sure you do not have any active R instances while making the update.
Orhun