Just highlight the download in the download window when it is complete and click remove ( I am quoting these from memory so might not be exactly accurete lol) You can also click remove completed downloads but this will also clear those awaiting sources. You cannot delete it from the search window. Also you can go to options > downloads>clear completed downloads> enable this and all downloads will be removed from the window as soon as they are complete. I don't usse this, as I like to check that I can find the files before I clear the downloads.

I hope this helps.

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