Mac Appstore We could not complete your request error 13

The Problem:  when you try to update your apps

The fix:

Note: make sure you have a timemachine backup before you do this or some other form of system backup

  1. login out of appstore
  2. close appstore app and make sure it’s not running in background (is out of your bottom launcher with a white circle under its icon)
  3. open safari
  4. empty cache from the safari menu
  5. open preferences from safari menu
  6. privacy then remove all website data
  7. Note ~\Library could be hidden on 10.7, if it is run from terminal “chflags nohidden ~/Library/” or “chflags nohidden /Users//Library”
  8. delete ~\Library\Caches\com.apple.appstore
  9. delete ~\Library\Cookies\com.apple.appstore.plist
  10. open appstore and try to update your apps again
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