Halena Theme update installed in WP, but reverts to Halena default content

HELP PLEASE. I downloaded and installed the WP update for Halena 1.6 (from 1.5.7), but this resulted in my website content disappearing and the default Halena content being used. I got a developer to revert to the older version to get it back online with my content, but they said to get in contact with the Theme author, so here I am. How can this be fixed please? I can forward any tech info to my developer as I my knowledge is limited with these things.
Thank you

Contact the theme author here:

Thanks. Looks like something else to pay for… I’ve sent a message in the mean time. Appreciated.