Boonex just release Dolphin 7.0.4 Beta. It is available for download and test purposes.
You should not upgrade from dolphin 7.0.3 to 7.0.4 beta. Do not try you could have problems later.
Again Dolphin 7.0.4 Beta is just for testing.
Generally Boonex will release Dolphin 7.0.4 final within a few days after the beta if all seems well. So either try the beta as stand alone for testing, or be patient for and wait for the final release. It is also wise to wait even longer to see if others report any issues or problems with upgrading in the Boonex Unity forums.
Some people are eager to upgrade for some reason and the neglect to notice that boonex does not provide an upgrade from 7.0.4 beta to 7.0.4 stable. It's not worth the risk of messing your site up.
More information available at:
Dolphin 7.0.4 Beta is Here!
We don't plan to keep it Beta for too long, so any quick testing is highly appreciated. Note, however, that there will be no update packs from this beta to the final release.
Have a look if interested in the Beta release. Otherwise, you should see the final Dolphin 7.0.4 release soon.