4
For this specific bit of XOOPS output, you should edit /modules/mydownloads/templates/mydownloads_download.html then update the module in the admin panel (simply modifying the .html file won't do the trick).
If this doesn't solve it, please report back and we shall rip MyDownloads's guts until it behaves just like you tell it to
As a bit of useless advice, you shouldn't hack php files for this: I guess it won't do any harm, but you'll have a harder time upgrading when (if?) you have to.