I have tried the Help>Update menu option many times on many day but the server appears to be permanently unavailable. I have tried a manual download and have run that download but the plugin still displays 7.1.0. This is really so frustrating and I am unable to load raw files from my Panasonic G6.
I just tried Help / Updates on my PSE11 and it worked ok, so there may be something blocking it on your computer, like a firewall or other internet security.
It launches the Adobe Application Manager which I think you can launch independent of PSE11.
You might be able to find out some things to try on this page: