What is the current version of the Respironics software?

Hello, I currently have EncoreViewer 2.0.23.0, but it seems there are newer versions of the software out there.
Can someone tell me what the latest version is, and who carries so I can purchase it?
I see that there is an EncoreViewer 2.1 available. I just want to make sure I have the most recent version before I spend $100 to upgrade.

thanks,
Todd

I have a system one Remstar auto with A-flex 550P

Viewer 2.1 was added a few months ago so that the new PR System One 60 series users would be able to get their data.
The reports are the same. It's not worth another $100. They didn't do any drastic changes.
They just made it so it wasn't limited to 32 bit computers anymore and they made it compatible with the 60 series (as well as the older machines).
Viewer 2.1 is the latest in the patient user software.