There are three documents available for download to guide RUP users.
The first document, The Rural-Urban Projection (RUP) Program, A User's Guide, contains a complete overview of the RUP, RUPEX, RUPAGG, and RUPCombine programs.
The second file, Population Analysis with Microcomputers, Volume I (2013 revision), contains a presentation of analytical techniques.
The third file, Population Analysis with Microcomputers, Volume II (2012 revision), contains the complete set of PAS spreadsheets and instructions on how to use them.