Rick wrote (2020-11-11):

 RS> Greetings All!


 RS> Ive decided to explore the old days and run maximus again or atleast see
 RS> if I can... I am trying to build the linux variety and run into this
 RS> error..

 RS> Warning: could not find install_tree. Did you forget to unpack
 RS> max-3.03-etc.tar.gz?

 RS> Now I have downloaded the src twice and unpacked it twice using different
 RS> methods and install_tree never presents itself? Suggestions?

go to releases and download the file:

https://github.com/sdudley/maximus/releases/download/v3_03b/max-3.03-etc.tar.gz

AFAIK it's not needed for building, only for "make install".