When you click "check for updates" you will always see a red warning
"Download ClamWin Free Antivirus Update "
followed by an ad
followed by either a "download now" link or a "your up to date" type message.
This is bad for end users who expect red=bad and "download this"==not up to date.
I would recommend changing the the result to a green (up-to-date) or red (needs update) large text display instead.