Sorry, but the plugin checker is a little limited in its opinion of what PDF plugin you should have...

Adobe Reader 11 For Mac

Adobe is still updating Adobe Reader XI (and Adobe Acrobat XI) and the corresponding plugin (version 11.0.11.18) but the plugin checker now considers the new Adobe Reader DC and its later-versioned plugin to be the 'current' version. As long as you are using the latest according to the Help menu > Check for Updates from within Adobe Reader XI (or Adobe Acrobat XI), then you can trust that and ignore the plugin checker site.

Adobe Reader Update For Mac 10.9.5

Or you could get the new Reader DC, but I suggest waiting a bit until the bugs settle out.

Adobe Reader Update For Mac Free Download

My reader has stopped working a few weeks ago. I checked for updates and I am up to date with the Adobe version. Keep track of the latest updates of all Adobe products.