Updating NBAR Protocol Pack on Cisco 2811 IOS Ver 12.4(3d)

Hi All,

Have a Cisco 2811 router with IOS Ver 12.4(3d).  Am wanting to use NBAR to try and limit use of bittorrent and other related P2P services.  I understand the commands I need to use are as follows"

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ip cef
class-map match-any BLOCK_P2P
match protocol kazaa2
match protocol winmx
match protocol edonkey
match protocol gnutella
match protocol napster
match protocol fasttrack
match protocol bittorrent
!
policy-map DROP_P2P
class BLOCK_P2P
drop
class class-default
!
interface FastEthernet0/12
service-policy output DROP_P2P

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This example assumes my WAN interface is fa 0/12.

When I do a sh ip nbar version command It shows I am using NBAR Software version 4.  It does not include the bittorrent protocol.  Can I download and upgrade the NBAR software, or do I need to upgrade the whole IOS?  From what I have read elsewhere I should be able to download new NBAR protocol packs, but can't seem to find them on the Cisco website.