The curl command pipes the result from https://laravel.build/example-app to bash and execute it.

If I read the web routes url that you provided you can see that example-app can be anything you want to change the name. And you can add a php variable to the url to change the PHP version. (Example: https://laravel.build/slinkmagic?php=8.0 )

But it will always execute the laravel new command form the Laravel installer. ( https://github.com/laravel/installer/blob/master/src/NewComman... )

And that will be the latest version.

So in short: You can't create a project for an older Laravel version with the sail / curl install method.

(Personally I should advice you to create every new project with the latest version but I don't know your reasons to use an older version.)