Update

Hey Hans Löwer,
Thanks for your question, your theme version is very old, unfortunately a while back Envato (Theme Forest) changed how updates are done and you will need get the latest version from your Envato account and manually update, then after you update you can create a Envato Token in your Theme Forest account so that future updates can be done easily, but your current version will not work with the Envato Token.
To update your version of Enfold you will need to download the latest installable WP version from your Theme Forest account and upload it to your WordPress ▸ Appearance ▸ Themes ▸ Add Themes ▸ Add New

after you choose the zip file and click install, you will see a This theme is already installed message because you are updating, you can continue

then you will see the Theme updated successfully message.

Best regards,
Mike