How did you 'move' the file? Was it using the site File Manager, by FTP or...Note A Download consists of o lot of database info, possibly pictures and usually a downloadable file. jD knows where the file was located from its entry in the database but if you moveit outside jD then the database is 'upset'!!So I suggest you delete both the old entry and the new one using jD, and then re create.
If you do want to move a Download then in backed use the Batch button on the Downloads