These files are all release candidates this means:

The release candidate files have been substantially tested over three months since the last beta release, you may encouter bugs but we are confident that these should not be mission critical bugs. We still advise that you intially install on a test server.

Fabrik 2.0 is designed for PHP5.2+ mySQL4 + and Joomla 1.5.3+ and will not run on Joomla 1.0.x. 

Fabrik 1.0.x is written for Joomla 1.0.x, and will not run on Joomla 1.5.x (even in legacy mode)

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