Please read the following instructions if you want to upgrade rather than reinstalling.

Reinstalling is the easiest, but if you want to keep your current server list / settings, do the following.

Copy you database file from /application/config/database.php upload all the files then replace database.php with your saved version

Check your current version and run every SQL statement from your current version, up to the latest version

If your current version is:

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v1.1
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ALTER TABLE  `settings` ADD  `setting_email_notification` VARCHAR( 255 ) NULL DEFAULT NULL