Sorry to hear that you have problem with Git. It seems that the i18n module is not present (i.e. the ./i18n/i18n.lua script is missing). You can try to fix the missing deps by running git submodule update --init --recursive inside world-edit's folder.
You may also get the archive available here.
Thanks for the suggestion. I did verify that all files were in place first; however, I tried running the Git command you gave me and the game crashed on load. I then tried installing manually from the link you gave me, and it started, but now reads "command not found" when trying to issue a command.
Is there something else I need to do before using scripts?