@noppie - You should not be having to do anything other than loading the files and logging into the admin. The rest should be done automatically.

You don't mention the version of ZC you are using but, with 1.5.7 AND a pre-existing version of EO, we have found that running the uninstall_eo.sql file located in docs/edit_orders/uninstall and then logging back into admin (refreshing the home page) will properly load the mod.

SO....If you had EO before, loaded the new files, and the mod did not "do it's thing"; try running the uninstall_eo.sql file and clicking admin home when you're through.