Dear Sir/Madam Hello I'm Ph.D student of psychometric at the university of Tehran.I use R version 1.8.1. I want to upgrade the R into higher version.I downloaded the latest version "R-1.9.0.tgz". Unfortunately I could not to upgrade the R. Could you tell me how I can to upgrade the R,please? Best regards Asghar Minaei ===== Yours...Asghar Minaei