Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires acquia/acquia_cms * -> satisfiable by acquia/acquia_cms[dev-develop]. - acquia/acquia_cms dev-develop requires drupal/acquia_cms_tour dev-develop -> satisfiable by drupal/acquia_cms_tour[dev-develop]. - drupal/acquia_cms_common dev-develop requires drupal/core ^10.2.2 || ^11 -> found drupal/core[10.2.2, ..., 10.4.x-dev, 11.0.0-alpha1, ..., 11.x-dev] but it conflicts with your root composer.json require (9.5.11). - drupal/acquia_cms_tour dev-develop requires drupal/acquia_cms_common ^1.9 || ^2.1 || ^3.1 -> satisfiable by drupal/acquia_cms_common[3.x-dev (alias of dev-develop)]. - drupal/acquia_cms_common 3.x-dev is an alias of drupal/acquia_cms_common dev-develop and thus requires it to be installed too.