The latest version of the Warcraft 3 world editor was version 122, which did not support version 120 of Warcraft 3. If you want to use version 120 of Warcraft 3, you need to download and install version 120 of the editor. However, it was important to note that there were differences between the 120 and 122 versions of the editor, so it was best to understand and familiarize yourself with them before using them.