add_action( 'woocommerce_account_downloads_columns', 'custom_downloads_columns', 10, 1 ); // Orders and account
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add_action( 'woocommerce_email_downloads_columns', 'custom_downloads_columns', 10, 1 ); // Email notifications
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function custom_downloads_columns( $columns ){
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    // Removing "Download expires" column
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    if(isset($columns['download-expires']))
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        unset($columns['download-expires']);
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​
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    // Removing "Download remaining" column
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    if(isset($columns['download-remaining']))
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        unset($columns['download-remaining']);
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​
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    return $columns;
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}