Centaur install problem

[rlin@berry.fcit.monash.edu.au (Richard Lin Kuang-Hsu)]

=> 
=> Dear Sir,
=> 	We are installing our copy of Centaur. Unfortunately,
=> There are some problems occured, and we don't know how to solve it.
=> 	1.We can't find the sub-directory lelisp/v15.24/system. So we
=> can install the Le-Lisp first. Is that included in the tape, or we have
=> to purchase a copy of that.
=> 	2.When we type 'system', it always come out "Exec format error.
=> Wrong Architecture." We are using Dec5000 with X11 under Ultrix v4.3.
=> Will it affect the installation.
=> 
=> 	Please give us a help. Thank you in advance.
=> 
=> Richard.
=>