I went to update Evernote yesterday through the Appstore but it failed to complete. It automatically closed Evernote when it started the update. Now I cannot open Evernote. It says 'Evernote is currently updating'. In the Appstore it says 'an error occurred' next to a dark grey button 'update'. If I click on update it comes up with a box saying 'Evernote failed to download Use the purchases page to try again'. When I go to the purchases page and click on update it comes up with the same box. How do I fix this problem or open Evernote?