The UNIX version of PREPRO2002 comes with FORTRAN source codes, in compressed form. 1) To uncompress and install, copy INSTALL.BAT and PREPROZ.Z to your hard drive. Execute INSTALL.BAT - WARNING - DO NOT execute PREPROZ.Z, or the system will not properly install into a directory structure. After installation you can delete PREPROZ.Z and INSTALL.BAT. 2) This system comes with batch files to compile and load all of the codes, and clean up the final form of the PREPRO directory. Execute the batch file for your type of computer, e.g., SUN.BAT, SGI.BAT, CRAY.BAT, etc. This could take between 5 and 45 minutes to complete. If the codes EVALPLOT and COMPLOT fail to compile and load then you may need to change the path in the Makefile to the directory that contains your X-Windows routines, i.e. /usr/lib/X11 3) To VERIFY proper installation, it is recommended that after installation you execute VERIFY. This is a batch file that will run the codes in sequence. 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. 4) If you have any problems notify the Nuclear Data Section, IAEA, Vienna, Austria. services@iaeand.iaea.or.at