One isn't well served by something that old. Our knowledge of Akkadian (and the Sumerian predeccesor) has improved since the early twentieth century, as your very link notes. Some Akkadian hapaxes in Gilgamesh that baffled early translators can now be read on the basis of comparative Semitic or other work.

If you want a free translation online of a great work of literature, you don't have to limit yourself to old public-domain stuff. The shadow libraries will have more recent editions.