For users on Adobe Reader version 10.x or earlier, Adobe strongly recommends upgrading to Adobe Reader XI. The latest version of Adobe Reader XI is 11.0.06, for which full installers are available for download from here for English, French, German, Japanese, and Spanish. For other languages, install Adobe Reader XI 11.0 from here. Then, update it to the latest version by applying 11.0.06 patch which can be downloaded from Support download Pages.
For Adobe Reader version 11.x, the latest available update is Adobe Reader 11.0.06. To update Adobe Reader 11.x, download and install Adobe Reader 11.0.06 patch from Support download Pages. Adobe Reader 11.0.06 patch is cumulative and hence can be applied on any existing version of Adobe Reader XI.