Silverstripe - Fresh installation no install page - silverstripe

I installed Silverstripe via Composer, just as described in the Silverstripe lessons.
It worked fine and the page is accessible by localhost.
I'm using XAMPP (newest version) with Apache and MySQL running.
Plugin php-intl is also enabled.
However, when I try to access the site it shows me the following message:
SilverStripe Framework requires database configuration defined via .env
I should see an install page, but there's just this message.
It is a completely fresh Silverstripe project. No changes have been made.
What can I do to fix this problem?

As described in the Silverstripe getting started guide we need to create a .env file and set it up with our environment variables.
W create a .env in our project root (not the public/ folder). In this file we set up the minimum required environment variables. Replace the placeholders as required:
SS_DATABASE_CLASS="MySQLDatabase"
SS_DATABASE_NAME="<database>"
SS_DATABASE_SERVER="localhost"
SS_DATABASE_USERNAME="<user>"
SS_DATABASE_PASSWORD="<password>"
SS_DEFAULT_ADMIN_USERNAME="admin"
SS_DEFAULT_ADMIN_PASSWORD="password"
SS_ENVIRONMENT_TYPE="dev"
Now we should be able to build our database by visiting http://<local-website-url>/dev/build.
Our website should be available on our local domain now.
Note, Silverstripe previously was packaged with an installer UI. This was removed from the core framework in version 4.5 and moved into it's own separate silverstripe-installer-wizard module. This can be added to the project by running composer require silverstripe/installer-wizard.

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