Dear Peter,
Please follow the steps below to update the theme.
1. Go to Appearance -> Themes
2. Active another theme & delete the Hoskia
theme
3. Click Add New -> Upload
4. Upload, install & activate the latest version of Hoskia
theme
Or check out the article https://www.wpbeginner.com/wp-themes/how-to-update-a-wordpress-theme-without-losing-customization/ to update the theme.
Follow the steps below to update the plugin.
1. Go to Plugins
2. Deactivate & delete the Hoskia Core
and WPBakery Page Builder
Plugins
3. Go to Appearance -> Install Plugins
4. Install & activate the latest version of the plugins
Best Regards,
ThemeLooks Support Team