The PowerMAC version of PREPRO2002 comes with executables codes, in compressed form. 1) To uncompress and install, copy PREPROZ.sit to your hard drive, and then use Stuffit Expander on PREPROZ.sit. After installation you can delete PREPROZ.sit. 2) To VERIFY proper installation, it is recommended that after installation you execute the codes in the order shown in the file named VERIFY (this is a batch file, that on other types of computers will run the codes in sequence; on your PowerMAC you will have to do this manually). The final two codes will display the calculated cross sections (EVALPLOT), and compare the results you calculated to a standard set of results (COMPLOT). Difference of about 1 % are acceptable; larger differences indicate an installation problem. 3) If you have any problems notify the Nuclear Data Section, IAEA, Vienna, Austria. services@iaeand.iaea.or.at