I have WristOx2, which does not work With nVision version 5.1. I have two Palmsat 2500 which work well with nVision 5.1. I have three Respsense with appropriate driver.
I have checked the official website, but there is no indications related to the upgrade of the application. However, there are user guides for version 6.3 and 6.4. You can download them using the link below.
Manuals page: http://www.nonin.com/softwaredownloads
Since it's impossible to download the application because it's deployed only on CDs, I can't test the update feature.
Contact Technical Support for further information: http://www.nonin.com/TechServicesContact