Just a quick update.  If you want write scripts that will auto-update/download the latest OWASP ModSecurity CRS archive, referring to the info here -

We are no longer hosting the CRS rules repository on the www.modsecurity.org site as that forwarded to the old files on the SourceForge site.  All current rules data in on GitHub.

Ryan Barnett
Trustwave SpiderLabs
ModSecurity Project Leader
OWASP ModSecurity CRS Project Leader

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