Update file 4.0.4.0 is corrupt. Now what?

I'm on BC 4.0.2 and I got this message that a new software version is available. So, I downloaded the file and the menu item changes into "Install Update Now...". Then BC closes and the extraction begins. Whoops, error message. "File is corrupt".

I tried the same on another pc at my work, with the same result. Now what?

Can I reload the update? Are there maybe other options now that the "Check for software update" (or how is it called, can't see it anymore) has gone?
Thanks in advance.