Well, that didn't work! I copied the contents of the Snow Leopard oah folder to the Lion one, after first renaming the RosettaNonGrata file to "RosettaNonGrataOld"--attempting to launch Eudora fails. I then renamed the Snowy RosettaNonGrataSL, and removed the "Old" from the Lion. No go. No matter which of the RosettaNonGrata files I use, If I run the Terminal command:
sudo sysctl kern.exec.archhandler.powerpc
I receive the unhappy answer
Not the "translate" answer the poster reports getting. So I don't know what the person did, looks like it was something other than copying the stuff from a working Snow Leopard folder!
I'm glad I'm not the only one who found this didn't work. I just spent several hours trying every possible configuration without success. I even used the Rosetta installer from Snow Leopard. I just want to be able to use Tex-Edit Plus!