Upgrade from 1.2.3 to 2.0 failing

After upgrading my site was throwing 500 errors. Log file has this:

[19-Mar-2017 14:40:15 UTC] PHP Fatal error: Uncaught Error: Call to undefined method GFAPI::save_form() in /home/username/public_html/wp-content/plugins/gravity-forms-entry-expiration/class-gf-entryexpiration.php:726

I will be downgrading for now.