DiegoPino elimine todo de la carpeta public_html como me dijiste pero ahora cuando el comando:
omposer create-project flarum/flarum . --stability=beta
me sale este mensaje:
[foropcgq@server150 public_html]$ composer create-project flarum/flarum . --stability=beta
Installing flarum/flarum (v0.1.0-beta.7)
[InvalidArgumentException]
Project directory ./ is not empty.
create-project [-s|--stability STABILITY] [--prefer-source] [--prefer-dist] [--repository REPOSITORY] [--repository-url REPOSITORY-URL] [--dev] [--no-dev] [--no-custom-installers] [--no-scripts] [--no-progress] [--no-secure-http] [--keep-vcs] [--no-install] [--ignore-platform-reqs] [--] [<package>] [<directory>] [<version>]
[foropcgq@server150 public_html]$