hello! where is source from the Jar file that is bownloaded by this installer https://clojure.org/guides/getting_started#_installation_on_linux ?

It's an uberjar built from this https://github.com/clojure/tools.deps.alpha

The installer's source is here https://github.com/clojure/brew-install (the shell scripts etc) and that readme talks about the components, including the uberjar above @stebokas