Did you purchase a SmartNET support contract for the sensor?
If so then this should entitle you to a user account on www.cisco.com from which you can download the updates:
http://www.cisco.com/kobayashi/sw-center/ciscosecure/ids/crypto/
Ifyou have not purchased a SmartNET support contract then you do not have access to the downloads.
You will need to contact the sales representative from where you purchased the sensor and ask for temporary access to www.cisco.com.
This will allow you limited time access to www.cisco.com so you can download and install the latest updates to today.
But for future access, the SmartNET contract is required. The updates are not free; their cost is currently included in the cost of the SmartNET contract.
