That download isn't anymore available, I guess it had to many bugs and Cisco removed it from the download portal.
Here is the newest 4.4 version:
https://software.cisco.com/download/release.html?mdfid=286281283&softwareid=282364313&release=4.4.03034&flowid=72322
Please note that you will need an entitlement to be able to download the software.
If you really require the old version, you probably have to open a TAC.
