Your requirements could not be resolved to an installable set of packages. Problem 1 - acquia/blt[dev-main, 14.x-dev] require drupal/core ^10.0.0 -> found drupal/core[10.0.0-alpha1, ..., 10.4.x-dev] but it conflicts with your root composer.json require (11.x-dev). - acquia/blt 14.x-dev is an alias of acquia/blt dev-main and thus requires it to be installed too. - Root composer.json requires acquia/blt * -> satisfiable by acquia/blt[dev-main, 14.x-dev (alias of dev-main)].