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
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.
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please follow the below path
Download Software
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Branch Routers
Cisco 2800 Series Integrated Services Routers
Cisco 2821 Integrated Services Router
Software on Chassis
Protocol Description Language Module (PDLM) Software-BitTorent 3.0

To install the BitTorrent PDLM, one of the Cisco IOS software versions must be in use on your network:
• Cisco IOS Release 12.1
• Cisco IOS Release 12.2T
• Cisco IOS Release 12.2S
• Cisco IOS Release 12.3
• Cisco IOS Release 12.3T

Beginning with Cisco IOS Release 12.4T, the BitTorrent PDLM is “native” to (that is, automatically
included with) your Cisco software. If you are using the Cisco IOS Release 12.4T (or higher), you
do not need to complete the installation procedure listed below.

Network Based Application Recognition (NBAR) Protocol Pack 4.0.0 is supported on Cisco ASR 1000 Series Aggregation Services Routers and Cisco ISR G2 Series Integrated Service Routers.

attached  pdlm installation guide ..

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