There isn’t anything to install. Just download the latest JAR file from Google Code and place it in an easy to locate folder.
Closure Compiler can be downloaded from here: https://code.google.com/p/closure-compiler/
If you have PhpStorm 7 installed you should already have Java and everything needed to run the Closure Compiler. Verify that you’re able to execute the compiler by checking what version is installed..
C:\>java -jar compiler.jar --version Closure Compiler (http://code.google.com/closure/compiler) Version: v20140110 Built on: 2014/01/14 16:25
If it doesn’t work and you need to install Java JRE, then download it here: http://java.com