You can actually use cheat engine. Instead of opening a process, use it to open the exe file. I'm not sure that that program is great for hex editing though seeing as it's not what it was designed specifically for.

There's Hex Editor Neo as well but for what you're trying to do, I'm not sure that it's the best. Also next time you crack something, don't allow it to call home, block it through your firewall -_-