如何安装自定义版本的 symfony?

How to install custom version of symfony?

我想用 composer 安装特定版本的 symfony:

 composer create-project symfony/website-skeleton blog 4.2.9
 composer create-project symfony/website-skeleton:4.2.9 blog

在 --help 中有:

php composer.phar create-project vendor/project target-directory [version]
php composer.phar create-project vendor/project:version target-directory

但是我得到一个错误:

  [InvalidArgumentException]                                           
  Could not find package symfony/website-skeleton with version 4.2.9.  

虽然存在https://symfony.com/blog/symfony-4-2-9-released

没有。检查 https://packagist.org/packages/symfony/website-skeleton 您必须要求确切的版本,例如。 4.2.9.1