If you mean official release, then i don't know. You can try using the latest nightly builds though:
http://bamboo.igniterealtime.org/browse/SPARK-INSTALL4J
press on a builds number (e.g. #600), then menu Artifacts > then install4j link. E.g.
http://bamboo.igniterealtime.org/browse/SPARK-INSTALL4J-600/artifact/JOB1/Instal l4j/
First one is usually the one you need for Windows (with java included).