Hi Shoba. Be sure to ask your VizAlerts questions in our group here: VizAlerts -- we're pretty on the ball about answering questions over there.
The answer is that I wished that I'd built it in 3.x but didn't. Someday we'll convert it over, but today is not that day.
I don't have experiencing running two versions of Python on the same machine, but based on a bit of Googling, I think you're right--just make sure you're calling Python from the explicit path it belongs in, e.g.:
I wouldn't rename the executable filename though.
I ll try out this option and find how it works