How to install lumen 11

composer create-project --prefer-dist laravel/lumen app-name you can this command to create project with lumen

@amoktar

Lumen 11, no longer supports beginning new projects with Lumen. Instead, we recommend always beginning new projects with Laravel.

Note: In the years since releasing Lumen, PHP has made a variety of wonderful performance improvements. For this reason, along with the availability of Laravel Octane, we no longer support beginning new projects with Lumen. Instead, we recommend always beginning new projects with Laravel.

Ref: https://lumen.laravel.com/docs/11.x/installation

However, I think you can still run the standard composer command to create the project as @bilal_swl suggested.

Ref: https://lumen.laravel.com/docs/10.x/installation