Enigma X

Hello all, I am having a slight problem in FL studio 4 pro, the vocoder plugin refuses to work, something about a version mismatch ? I was wondering if there was a free replacement plugin for a good vocoder, as i used it many a time(though this wasn't origionally mine, I bought 3 standard many moons ago, yet when a friend gives me this when he purchases sonar 3 pro....My vocoder setup dies), so any help would be appreciated