I need help with fixing this please. organic-farm-pro/woocommerce/checkout/form-checkout.php version 2.3.0 is out of date. The core version is 3.5.0,
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Go to Woocommerce folder >> templates >> Checkout >> form-checkout.php >> replace that file with current theme file. The issue will be resolved.
Please do that carefully and also please take backup of your site before proceeding further.