clojure-1.2.0.jar from here http://build.clojure.org/releases/org/clojure/clojure/1.2.0/
clojure-contrib-1.2.0.jar from here. http://build.clojure.org/releases/org/clojure/clojure-contrib/1.2.0/
Clojure requires java JDK so if you don't have it installed then you can download it here.
For Linux, create a shell script called clojure with the following lines and put it in your command path.
java -cp "path/to/clojure/*:$PWD" clojure.main "$@"
For windows create a bat file called clojure.bat with the following content and set your windows path to the clojure folder.
@echo off java -cp "path\to\clojure
\*;." clojure.main %*