The final 5.x version (5.47e) should be available in the member area for download. I highly reccommend getting it as well as upgrading to the latest (6.7.1) as it has a lot of preformance enhancements and features (hey even for a site that just uses the board as an archive can benefit from better preformance)...

You could also follow the migration instructions here for upgrading your 5x sceries board to 6x.

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