I think you will need to update the theme, required plugin and the WordPress it self. In this case, before doing update please make a backup for your site.
Please download the latest version of Jkreativ on Themeforest (v2.4.2) then you need to check all of required plugins because we’ve include update version for some plugins.
For more detail please check our documentation about doing updating here http://support.jegtheme.com/documentation/themes-plugins-update/
Please let us know if you need help in there.