"Unable to download firmware. Please check your internet connection..."

I’ve just bought an ATV2 and I’m trying to JB it using seas0npass. Unfortunately I fail at step 2 “Select the ‘Create IPSW’ button to start the jailbreak process.” When I click this I get a message which reads:

 

Unable to download firmware. Please check your internet connection or firewall settings and try again.

 

I’ve checked my internet, turned my firewall off and also tried running seas0npass as administrator. I get this message each time, so it looks like I’ll be stuck until one of you good good people tells this n00b what to do. Hopefully there is a solution to this.

 

I’m running Win7x86 and have the latest version of seas0npass.