Try this code. It's retrieving the page but the link itself is throwing error "Error: please select a prediction method!".

#!C:/perl/bin/perl.exe

use LWP::UserAgent;
use HTTP::Request::Common;


my $url = 'http://tools.immuneepitope.org/tools/bcell/bcell_Prediction
+';


# Set up the ntlm client and then the base64 encoded ntlm handshake me
+ssage 
my $ua = new LWP::UserAgent();
    

$request = GET $url;
print "--Performing request now...-----------\n";                 
$response = $ua->request($request); 
                    

print "--Done with request-------------------\n";                 

if ($response->is_success) {print "It worked!->" . $response->code . "
+\n"}  

else {print "It didn't work!->" . $response->code . "\n"}             
+      


#Save the case to the local PC                            

$response = $ua->mirror($url,"c:/test/perlmonks.htm");
[download]

I would suggest using WWW::IE::MechanizeWWW::IE::Mechanize or WWW::SeleniumWWW::Selenium as the page uses Javascript.