You're saying that you "played on a older version and then downloaded a new one here". That's quite vague. What you definitely shouldn't do is treat this mod as an upgrade for your game. Mod version 0.8.6m1 really only works for Eternum 0.8.6, you can't use it on an older version, like Eternum 0.7.5. You can download new versions of Eternum here.
But if you're sure that you've matched the versions properly and are still having trouble, you have to send me a screenshot of the "script looking thing", otherwise I won't be able to tell what's wrong.