Can't Delete Old Update Files

I am trying to delete 2 ‘old’ Update files from my Download folder. Update 8.0.10 and 8.0.20. One is 350MB the other 415MB Being of no use anymore as am running 8.0.30 I would like to delete them. Every time I try, or even try to move them to another file I get the message - “cannot delete, files are open in explorer.” The only place I can find them ‘open’ is in the download file I am looking at. Has anybody else had this issue this?