Hello,

1. You need to create a staging site with the fresh WordPress installation, upload, and install WoodMart with the WP bakery page builder. https://xtemos.com/docs/woodmart/installation-process/

2. Create Header builder https://xtemos.com/docs/woodmart/header-builder/ and restore your current header from your live site.

3. Install free classic widgets plugin and copy-paste text widgets in Appearance > Widgets.

4. Export-import the content by means of Tools > Export/Import.

5. Make the final configuration and move all the sites to the live site, you would better reset move the site to fresh WordPress installation.

This is the only way to update the theme without losing most of your settings.

Your current theme version is very old and not compatible with the recent version. Any attempt to upload the recent version of the theme to the current site would cause to crash or incorrect work.

Best Regards