Hi.

You can download the last version from Envato or update it with the Envato Market plugin.

You can’t update from 2.0 to 3.0 without changing the content. Better roll back to 2.0 and I’ll update it for you.

For the WPbakery and Slider Revolution plugins update read this article https://help.pix-theme.com/knowledge-base/how-to-update-plugins-wpbakery-revolution-slider-pixcars/

Here is the version 3.1.0.

It is better to install the new version separately, import demo content there, and transfer information from the site as you need. And then replace the old site with the new one via the All-in-One Migration plugin.

Glad to help)

Please, try now. I had to update the PixCustom plugin.