DownloadCustomCss.php

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<?php
namespace Magento\Theme\Controller\Adminhtml\System\Design\Theme;

use Magento\Framework\App\ResponseInterface;
use Magento\Framework\App\Filesystem\DirectoryList;

class DownloadCustomCss extends \Magento\Theme\Controller\Adminhtml\System\Design\Theme
{
    public function execute()
    {
        $themeId = $this->getRequest()->getParam('theme_id');
        try {
            $themeFactory = $this->_objectManager->create(\Magento\Framework\View\Design\Theme\FlyweightFactory::class);
            $theme = $themeFactory->create($themeId);
            if (!$theme) {
                throw new \InvalidArgumentException(sprintf('We cannot find a theme with id "%1".', $themeId));
            }

            $customCssFiles = $theme->getCustomization()->getFilesByType(
                \Magento\Theme\Model\Theme\Customization\File\CustomCss::TYPE
            );
            $customCssFile = reset($customCssFiles);
            if ($customCssFile && $customCssFile->getContent()) {
                return $this->_fileFactory->create(
                    $customCssFile->getFileName(),
                    ['type' => 'filename', 'value' => $customCssFile->getFullPath()],
                    DirectoryList::ROOT
                );
            }
        } catch (\Exception $e) {
            $this->messageManager->addException($e, __('We can\'t find file.'));
            $this->getResponse()->setRedirect($this->_redirect->getRefererUrl());
            $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
        }
    }
}