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welcome to the forum.
Community versions are available from the download page.
You will not receive any patches or security updates except you use a newer version which will be AS7 or WildFly8.0 at the moment.
If you need to keep JBoss5 you might buy a subsrciption for the EAP release, here you can migrate to the EAP5.x version and you can donwload security patches and, depend on your subscription, download or request bugfix patches for this version.