ありがとうございます。

bin/console eccube:composer:require ec-cube/RecommendedProduct4
を行ったら以下のメッセージが返ってきました。どうやらまだうまくいってなさそうです。

<warning>Deprecation warning: require.ec-cube/CartClearV4 is invalid, it should not contain uppercase characters. Please use ec-cube/cartclearv4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/ECCUBE4LineLoginIntegration is invalid, it should not contain uppercase characters. Please use ec-cube/eccube4lineloginintegration instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/MGSocialButton is invalid, it should not contain uppercase characters. Please use ec-cube/mgsocialbutton instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/MailMagazine4 is invalid, it should not contain uppercase characters. Please use ec-cube/mailmagazine4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/Maker4 is invalid, it should not contain uppercase characters. Please use ec-cube/maker4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/ProductReview4 is invalid, it should not contain uppercase characters. Please use ec-cube/productreview4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/RecommendedProducts4 is invalid, it should not contain uppercase characters. Please use ec-cube/recommendedproducts4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/RelatedProduct4 is invalid, it should not contain uppercase characters. Please use ec-cube/relatedproduct4 instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require.ec-cube/SprocketTag is invalid, it should not contain uppercase characters. Please use ec-cube/sprockettag instead. Make sure you fix this as Composer 2.0 will error.</warning>
<warning>Deprecation warning: require-dev.mikey179/vfsStream is invalid, it should not contain uppercase characters. Please use mikey179/vfsstream instead. Make sure you fix this as Composer 2.0 will error.</warning>

In InitCommand.php line 751:

Could not find a matching version of package ec-cube/RecommendedProduct4. Check the package spell
ing, your version constraint and that the package is available in a stability which matches your
minimum-stability (stable).


require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--update-with-all-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--] [<packages>]...

15:59:53 ERROR [console] Error thrown while running command "eccube:composer:require 'ec-cube/RecommendedProduct4'". Message: "" ["exception" => Eccube\Exception\PluginException { …},"command" => "eccube:composer:require 'ec-cube/RecommendedProduct4'","message" => ""] ["file" => "/vendor/symfony/console/EventListener/ErrorListener.php","line" => 46,"class" => "Symfony\Component\Console\EventListener\ErrorListener","function" => "onConsoleError","uid" => "3d8e594","user_id" => "N/A","session_id" => "N/A"]

In ComposerApiService.php line 308:

[Eccube\Exception\PluginException]


eccube:composer:require [-h|--help] [-q|--quiet] [-v|vv|vvv|--verbose] [-V|--version] [--ansi] [--no-ansi] [-n|--no-interaction] [-e|--env ENV] [--no-debug] [--] <command> <package> [<version>]