First and foremost, DO NOT upgrade to any Beta releases. Doing so will lock you into the Beta as there won't be a formal way for you to upgrade from it to an actual release version.
Personally, I really dislike that Sugar promotes the use of the Beta in this way as it has the potential of leading many into future problems.
That aside, it is indeed at 6.x. Not knowing how you originally installed, it is hard to say why you have such a big gap.
Anyway, to upgrade to the most current, stable release (6.1.4), use these two files:
http://www.sugarforge.org/frs/downlo...1-to-6.1.0.zip http://www.sugarforge.org/frs/downlo...x-to-6.1.4.zip
You should test the process on a cloned/copied instance of your installation before running the upgrade against your production instance.
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