Which adobe reader can I download for Vista 64 bit?

Another Vista user here. Firefox is definitely not blocking me from using the current version 11.0.18 (there is nothing "current" about version 10.1.13). The pesky plugin checker appears to have been removed from the latest Firefox 50.0, but it certainly used to report that even 11.0.18 was "outdated." That might be because Firefox plans to end support for all NPAPI plugins except Flash Player before long: https://blog.mozilla.org/futurereleases/2015/10/08/npapi-plugins-in-firefox/#more-2327. To be clear, Adobe Reader 11 never officially supported Vista, but always officially supported Server 2008 (which is basically identical to Vista), and it does work on Vista. I should mention that my Vista is 32 bit. If there is anything unusual about my Vista installation that allows Reader 11 to work well, it is probably either (A) absolutely no trace of older Adobe Reader products or (B) no corrupt system files. Here's a good discussion of PDF options for Vista: http://www.bleepingcomputer.com/forums/t/624264/adobe-acrobat-reader-for-vista/

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I believe that version (which is so old it is unsupported) is also the latest you can use on Vista. There is no supported Reader for Vista, and none that gets security updates.