As of the date of this tutorial (May 2006) the most recent release is OpenSEF 2.0.0-RC5.

The "RC" in the release title means "Release Candidate". This means that the software is only a candidate for release, not a "final" release. It may contain bugs and is not recommended for production sites.

However, we're going to install it anyway, since many sites are using it with no problems. There are of course no guarantees that it will work.

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