At the moment, the best way is:
Apply latest
SVN
to sandbox, make sure everything works.
Install Fabrik on live site, and upgrade to latest
SVN
.
Export all the Fabrik internal tables (jos_fabrik_whatever), and your own data tables from the sandbox, and import them into the live site, using your tool of choice (phpMyAdmin, NaviCat, etc).
On the live site, go to the Fabrik Connections tab, edit and save the default site connection one time.
If you have custom file system based content, like uploaded files, script files, templates etc, copy those over.
We are working on our "Packages" feature, which when done will allow you to select a group of tables/forms on the sandbox, export them and import them into Fabrik on the live site. Which will make this whole process a lot easier. But for now ... the above is the best way of doing it.
-- hugh