Moving site to another domain, install appears I move the website to another domain on the same server, by copying all files to the other domain's folder.
When I visit the new domain the install.php appears. Trying to navigate to another page like /user/login redirects to the installer as well.

I don't think I need to change database settings because it's on the same server.

Any ideas why?
When install appears on a site that you expect to be fully installed, the problem is usually with the file settings.php (in the sites/default/ directory).

It may be missing in action, not visible to the web server user, or unable to establish the credentials to connect to the site's database.