I could not get anyone to create executables for PREPRO2026 - the compressed
MAC file is for the PREPRO2023 codes. I am hoping that some MAC user of the
PREPRO codes will create 2026 executables and send them to me for inclusion 
here. 
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The below only applies after I have obtained PREPRO2026 executables.

The MAC version of PREPRO2026 comes with executable codes and
data all in a single directory (RUN) in compressed form. All of the data
files in the MAC package are in DOS format, ready to be used on any MAC 
system. All executables were created on a MAC syatem and the RUN directory 
was compressed on a MAC system, improving the probability that executables 
will run on any other MAC computer. 
 
1) Copy RUN.7z to your hard drive. First uncompress this file to find
   a directory named RUN which contained 46 files. To uncompress we  
   recommend that you use 7-zip, which is available FREE on the internet,
   or any similar uncompressing code that you may have. RUN includes
   everything, codes and data, that you need to executable all codes.
   
2) To VERIFY proper installation, it is recommended that after install
   you execute VERIFY-ALL.BAT (Be sure to type the entire name, VERIFY-ALL,
   to avoid a conflict with the DOS verify command). This is a batch file
   that will run ALL of the codes one after the other in sequence.
 
3) The final two codes will display the calculated cross sections
   (EVALPLOT) and compare the results you calculated to a standard set
   (COMPLOT). Differences of about 1 % to 2% are acceptable; larger
   differences indicate an installation problem.
 
   If plots are displayed before the batch file (VERIFY-ALL.BAT) finishes,
   the system has been verified and is ready to use. If you do not
   obtain plots there was an ERROR during installation; in this case
   see case 5) below.

4) After running VERIFY-ALL the RUN directory will contain many large
   ENDF formatted data files and report (.LST) files that you may not
   be interested in - you can either using the original RUN file with
   46 files - or run CLEANUP to delete ALL of the files created by
   VERIFY-ALL - CLEANUP as supplied here includes simple commands for
   WINDOWS/DOS - for use on any other system YOU must change the
   commands, e.g., del to rm - copy to cp. 
 
5) If the executables DO NOR ALL RUN on your computer, try the OTHER 
   directory, to create your own executables> In this case start over 
   with both OTHER directories: SOURCES and RUN - Note: this RUN file
   is not the same as the RUN file under MAC; it does not include 
   any executables = you must create them.

6) If you still have any problems notify the Nuclear Data Section, IAEA,
   Vienna, Austria

   To contact the Nuclear Data Section, IAEA, use.
 
    services@iaeand.iaea.or.at