Hello,
Yes. But remember to save and test it BEFORE doing it on the production website ;)
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SEBLOD 3.0 is ready for both Joomla! 2.5 and Joomla! 3.x.
You'll find new features such as "Computation Rules", "Multi-page Forms", .. numerous improvements and optimizations..
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Source : http://www.seblod.com/v3/ test part after click on "get seblod"
And i already did it several times and it works.