Your version was 8 months old. Did you download from the site I linked you to above? Or did you download from some third-party distribution site? There have been many reports of outdated and corrupted versions on the third-party sites.
As I said in the earlier response, you normally should not delete anything before an update. Manager takes care of that. But if you got your original version from a third-party site, I recommend that you delete it.
BACK UP YOUR DATA FIRST ON A DIFFERENT DRIVE. WHEN YOU HAVE CORRECTLY INSTALLED THE NEW VERSION, RESTORE BY FOLLOWING DIRECTIONS HERE: