20 hours ago support posted this…
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Please upload all required theme patches mentioned in theme package to your site directory (from Patch for Magento 2.2.x > patch for Magento 2.3.1 & above)
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You can see the changes of each theme version in Porto preview page https://themeforest.net/item/porto-ultimate-responsive-magento-theme/9725864
That sorted it!