Thanks for the heads up.
However, someone on Talkchess is reporting that there appears to be some kind of Javascript malware on the Arena site. Although it seems that the actual downloads may be OK, you might want to avoid the site if you're not protected from Javascript attacks.
http://talkchess.com/forum/viewtopic.php?start=0&t=58648&topic_view=flat
Apparently just a bugfix release ---->> http://www.playwitharena.com/