Interface 'Psr\Http\Message\RequestFactoryInterface' not found

Please note, if you are using PHPMaker v2023, then by default it does not support SQL Server 2008 database. Since v2022, PHPMaker used DBAL version 3 that does not support SQL Server 2008 database. You may read documentation regarding this.However, you may try this trick if you want to obviously use PHPMaker v2023 with SQL Server 2008 database.