This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
That's the right link. When I click the link in your post, I get the Struts home page. I have no idea why you can't get to it. If you're going through a firewall or router, it's possible that the router blocks certain web sites. I'd suggest trying it again with a different internet connection.