When I started the installation of laravel, I used the command: "composer global require laravel / installer" and the installation of the last version is running normal. these forms did not work:
1 - composer create-project -prefer-dist laravel / laravel project-name 5.1. *
2 - laravel / laravel project-name 5.1. *
3 - laravel project-name 5.1. *
NOTE: do I have to reinstall laravel ?: if so, how to remove the previous version