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I am experiencing the same problem: update process stuck in updating database stage. I ran the SQL that was provided to another user with this same problem:
ALTER TABLE `jos_community_files` ADD `profileid` INT NULL DEFAULT '1' ;
please provide me cpanel or database manager access detail by editing your first post at this topic.
I will do it for you. before deleted duplicate entry. I must put new index field as primary key. after deleted need to remove it.