Latest version of HS 4

I'm running an older version of HS 4.0.1 on Win XP that I purchased a couple of years ago off of ebay and I'd like to get the latest upgrade for it to take care of a couple of small problems I've encountered. I've tried applying the Sonar 4 patches from the Cakewalk site, but I keep getting the error message "Cannot find Sonar 4 directory". Can anyone tell me where I might find the latest (last) upgrade Cakewalk made to HS 4? Thank you! Jim