There is no such thing as a "JWS installer". Stop looking for one. You don't "install" it. If you had understood how JWS works, you wouldn't be asking that.
Perhaps this paragraph from the document which you said you read and understood would help:
Beginning in the Java 2 Platform, Standard Edition 1.4.2 release, Java Web Start software is installed as part of the JRE software. Users do not have to install Java Web Start software separately or perform additional tasks to use Java Web Start applications.