Here's thanks to Robotguy4 for this link, looks like a legal way to get hold of v4. This page asks you to submit an email address and then allows you to download the 157Mb file.
"You have successfully registered. We have sent you a reference email with your username and password." I guess once you have that info you could then get v5 via the Antics website. I suspect it's a leftover from the old site so I wouldn't expect it to exist for very long.
Here's my disclaimer. I haven't tried it out as I wouldn't want to upset my existing licences/registrations. Use your own judgement.