Script is the best way to install UCW and all the libraries it requires.
The latest version of UCW is in the darcs
$ darcs get http://common-lisp.net/project/ucw/repos/ucw-core/
To update your copy of the code simply do:
$ darcs pull
You will be asked which available patches (if any)
you'd like to apply. You can either look at each patch
and apply only the ones with changes you want or have
faith in me and apply them all.