There is no such version as “3.3.”
According to your topic Cannot remove white noise/hiss - #3 by bandit1985 you are using a PHILIPS SBCMD110 mic which is a mono mic (single ring connector). So you don’t need stereo. A mono recording will play the same sound through both speakers of a stereo system. It is also nothing to do with your hiss issue.
If you want to record the same signal duplicated into left and right channel, please see Audacity Manual .
Gale