But also to answer your question, I have always been in the habit of uninstall, then do a clean install whenever upgrading to newer versions.
Too bad AC didn't work like Adobe Flashplayer or Acrobat. Those require a download and the upgrade just works. No new install process is needed. A few minutes and they are upgraded. That would go on my wish list for AC: updates that didn't require uninstall then reinstall to make them work properly.
