New version IMPREZA

Hi, i bought IMPREZA 2 years ago, i did an upgrade of new version yesterday in Wordpress but immediatily my page block it. What i can do?

Seem this:
Fatal error: Call to undefined function determine_locale() in /home/cgestal/public_html/wp-content/themes/Impreza/common/functions/helpers.php on line 144


Contact with your purchase item author @UpSolution hope they will helped!