Lein installation problems

gistfile1.txt

$ exec/lein
Downloading Leiningen now...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:00:02 --:--:--     0
curl: (22) The requested URL returned error: 404
Failed to download https://github.com/downloads/technomancy/leiningen/leiningen-2.0.0-SNAPSHOT-standalone.jar
If you have Maven installed, you can do
mvn dependency:copy-dependencies; mv target/dependency lib
See README.md for further SNAPSHOT build instructions.
Exception in thread "main" java.lang.NoClassDefFoundError: clojure/main
Caused by: java.lang.ClassNotFoundException: clojure.main
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)