• use code tags, please!
• A quick look at perldoc LWP::UserAgent revealed that:

       $ua->agent( $product_id )
           Get/set the product token that is used to identify the user
+ agent on the network.  The agent value is sent
           as the "User-Agent" header in the requests.  The default is
+ the string returned by the _agent() method (see
           below).
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However IIUC the page you found has links to the individual frames: just parse it, extract those links and donwload them.