Cheat Engine can not possibly be bad. Why? Because it's the lowest level of the basics of hacking. You look for a value, and you change it. Then it has mid-tier with hex editing and assembler. It does everything you need to hack a game. The only "bad" thing about it is that it can be detected quite easily in more popularized games. Other than that it's fine. And if you need a copy of CE go to the official website. They have an archived section as well so you can get any of the older copies.