Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires silverstripe/installer 5.2.x-dev (exact version match), found silverstripe/installer[dev-4.8-beta2, dev-post-2.4, 2.4.9, ..., 2.5.x-dev (alias of dev-post-2.4), 3.0.2.1, ..., 3.x-dev, 4.0.0-alpha1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev, 6.x-dev] but it does not match the constraint.

Your requirements could not be resolved to an installable set of packages. Problem 1 - silverstripe/recipe-cms 5.1.x-dev requires silverstripe/session-manager 2.1.x-dev -> satisfiable by silverstripe/session-manager[2.1.x-dev] from composer repo (https://repo.packagist.org) but silverstripe/session-manager is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/installer 5.1.x-dev requires silverstripe/recipe-cms 5.1.x-dev -> satisfiable by silverstripe/recipe-cms[5.1.x-dev]. - Root composer.json requires silverstripe/installer 5.1.x-dev -> satisfiable by silverstripe/installer[5.1.x-dev].

Your requirements could not be resolved to an installable set of packages. Problem 1 - silverstripe/recipe-cms 5.0.x-dev requires silverstripe/session-manager 2.0.x-dev -> satisfiable by silverstripe/session-manager[2.0.x-dev] from composer repo (https://repo.packagist.org) but silverstripe/session-manager is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/installer 5.0.x-dev requires silverstripe/recipe-cms 5.0.x-dev -> satisfiable by silverstripe/recipe-cms[5.0.x-dev]. - Root composer.json requires silverstripe/installer 5.0.x-dev -> satisfiable by silverstripe/installer[5.0.x-dev].

Process completed with exit code 2.