Thanks for replies of A.J. Rossini, Rich Heiberger and Rodney Sparapani . I have installed the newest ESS. But I still cannot work with S+6. After M-x S+6, it shows: ESS [S(S+6): sh] starting data directory? e:\temp\ Then it tells me "Searching for program: No such file or directory, sh" after RET. M-x Sqpe still works.