Installing ljupdate should be really really simple.

Just put the lisp/*.el files in your `load-path' somewhere. For
instance, my home directory has a subdirectory, ~/elisp/, in which
I keep elisp files. Under that, I have an ljupdate/ subdirectory,
where ljupdate lives.

Once you have that done, a simple (require 'ljupdate) in ~/.emacs
should do it!
