There's no major differences between pro & basic. erm ... what you download is up to you. Has nothing whatsoever to do with LW. You are the one who makes the choice & presses the download button from the search results. Perhaps lots of spammers connected to you recently. Sometimes you can be connected directly to them as ultrapeers.

LW updates do not generally happen that often. Check your preference options to see how you have it set to be notified about updates. Don't forget to bookmark your pro download page.