Lob le flooder!

It sounds like you have a firewall issue.
There are a couple of possible reasons you might be unable to download the game:
1. Your LAN settings my prevent access to the FTP site.
Please check Start -> Settings -> Control Panel -> Internet Options -> Connections (tab) -> LAN Settings (button). Check Automatically Detect Settings. Click OK to everything. That should let you access the FTP server.
2. Your firewall may block the connection.
Even the Windows firewall can also block your connection. Please try disabling it.
The game needs access to the following ports:
TCP: 27015 - 27021
UDP: 27015 - 27021
3. Change Passive FTP setting in Internet Explorer
If using Internet Explorer, please try going to Internet Explorer -> Tools -> Internet Options -> Browsing -> Use Passive FTP and changing the toggle setting there.