Just an update - I found the Autosave feature was indeed enabled as default - yet the Autosave file is empty. I was offered NO recovery document after closing and re-opening and thus I need to open the temp files. PLEASE let me know how this is done!
Info: Vista and Reader X are unsupported. Adobe will not fix this.
Reader writes Acr*.tmp files contains information in progress. These are not auto save files Nor anything to recover from. They are deleted on a normal close, suggesting you actually experienced a crash.
Since you say you saved, possibly it was saving but to a different folder. Repeat the test and check this out. After “save” use Ctrl+D to see the file location.
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A tip: before starting my suggested test, duplicate the PDF under a new name AND USE THE NEW COPY TO TEST so that you don’t accidentally overwrite your one good save somewhere.