Follow the necessary steps found
here to set up the game correctly (it should have the correct Nektulos files). If you want to use the in-game map it is still available in the newb zones. Unless you replace the current map file with the one found
here your Nektulos map won't be the correct one for classic (I don't know if it's included in the new .zip file). As far as Kerra Isle, I don't know.