Yep, I guess you downloaded the file from your cache... just refresh the link
.
For your problem RaveRod, it's because everytime Messenger starts, it recreates its value in the \Run key of the registry in order to ensure that it will start automatically next time Windows boots up. Messenger Plus! see this key and deletes it when Messenger exits. Instead, it uses its own key (which is not generally needed to be recreated) to launch Messenger (to ensure that Messenger Plus! is launched before MEssenger at startup).
I guess you should just configure your software so that it doesn't pop up anymore for msnmsgr.exe