I wasn't aware of the page update, there has been like two years since I used Clojure last time.
It used to be so that they provided a zip to download.
In any case as mentioned on a sibling comment, I assume that anyone willing to use a guest language should get comfortable with the host platform.
So git, well for better or worse that is what most are using nowadays.
Maven, number one build tool on Java world, even if using another one, most likely those jars are coming from Maven Central.
Just like, regardless of my opinion on C, I keep my C knowledge up to date, because that is what I eventually might need to reach to when on UNIX like platforms.
2 - Dowload clojure.jar
as a shorthand for
2.1 - Install Maven
2.2 - Install git
2.3 - Clone https://github.com/clojure/clojure.git
2.4 - Run mvn -Plocal -Dmaven.test.skip=true package