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on your Mac, click the Show Downloads button 
next to the filename in the downloads list. If you move a file or change the download location after downloading it, Safari can’t find the file.Tip: To change where downloaded items are saved on your Mac, choose Safari > Preferences, click General, then click the “File download location” pop-up menu and choose a location.
Clear the downloads list: In the downloads list, click Clear. To remove one item, Control-click it, then choose Remove From List.
By default, Safari automatically removes an item after one day. To change when items are automatically removed, choose Safari > Preferences, click General, then click the “Remove download list items” pop-up menu and choose an option.