Will I need to upgrade or update Lightroom 4 to accomodate images from a Nikon D810 ?
And just in case, can CS5 handle the D810 RAWfiles ?
You will need to purchase an upgrade to Lightroom 5 and install at least Lightroom 5.6 in order to have support for the D810. The current version is 5.7.1. An alternative would be to download the free DNG converter from Adobe and create digital negative copies of your raw images that could be opened in Lightroom 4.
Thanks for your assistance. I installed the cloud LR and photoshop. Problem solved.