According to Davis, if you didn't get the email, then don't update.
where to find? go to your weatherlink.com page. log in and then go to My Account. Look at the bottom of the page, My devices, you will see the firmware version you have.
I wouldn't upgrade unless Davis said you needed to. I had 1.0.9 and then tried to upgrade, not only did it brick my logger, but screwed up my console. Now both are on their way to be repaired. Fortunately I have two Envoys.