Sorry that happened to you. We've since improved our updater to avoid this happening again, but your loss of trust is understandable. Hopefully downgrading back to ST3 was not too big of a hassle.

ST4 has full backwards compatibility for plugins, keeping the same python 3.3 ST3 shipped with, so I'm surprised your setup broke. ST3 licenses were also fully transitioned to ST4, so any license less than 3 years old covered the initial ST4 release.