No, you don’t have to remove previous versions at all. Just install the new MyEclipse release in a different location than your previous one. And, if you’re not using our “all-in-one” installer, be sure to use a different Eclipse SDK instance as well. As long as the two installs are in different locations and don’t share any components there won’t be a problem with leaving multiple versions installed. For example, I must have 6 different MyEclipse installs on my development machine, for instance. 🙂