Price.php

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<?php
namespace Magento\Downloadable\Model\Product;

class Price extends \Magento\Catalog\Model\Product\Type\Price
{
    public function getFinalPrice($qty, $product)
    {
        if ($qty === null && $product->getCalculatedFinalPrice() !== null) {
            return $product->getCalculatedFinalPrice();
        }

        $finalPrice = parent::getFinalPrice($qty, $product);

        if ($product->getLinksPurchasedSeparately()) {
            if ($linksIds = $product->getCustomOption('downloadable_link_ids')) {
                $linkPrice = 0;
                $links = $product->getTypeInstance()->getLinks($product);
                foreach (explode(',', $linksIds->getValue()) as $linkId) {
                    if (isset($links[$linkId])) {
                        $linkPrice += $links[$linkId]->getPrice();
                    }
                }
                $finalPrice += $linkPrice;
            }
        }

        $product->setData('final_price', $finalPrice);
        return max(0, $product->getData('final_price'));
    }
}