You've deluded yourself into believing that a version with a MAJOR SECURITY HOLE is the best. You also have not run through ANY troubleshooting to find out if it's your settings.
ALL versions with a build number lower than 21515 are potentially vulnerable, not just 2.x.x lines. It doesn't matter what version of uTorrent it is (windows only), if its build number is lower than 21515, it is potentially vulnerable to this exploit.