Hi, Thanks for your question. You should be able to upgrade directly from 4.2.x Older than that required more steps. [URL]   Let us know if you have any additional questions.
Hello, we have a Unity 300 running UnityOS 4.2.3.9670635. Are we able to upgrade to the latest OS 5.2.1.0.5.013 directly? Or do we need to follow a specific upgrade path?   Thank you
Unity 300 Upgrade Path