As of Opera 10 you can set Opera to update automatically, notify of updates only, or to not even check for updates. I don’t use Opera daily however I probably do use it at least once a week for various tasks such as torrent downloads. Recently when I launched Opera it let me know that an update was available and asked if I wanted to download and install. I quickly clicked yes to upgrade Opera but realized that there was another option that was checked to upgrade Opera automatically in the future. I personally like to be notified about upgrades and then run the upgrade myself when it is convenient so I needed to modify this setting back to only notify me of new Opera updates. Below are instructions on how to set Opera web browser to upgrade automatically, notify you of Opera browser updates, or to not even check for new updates available for the Opera web browser.