Edit file File name : MantisBTInstaller.php Content :<?php namespace Composer\Installers; use Composer\DependencyResolver\Pool; class MantisBTInstaller extends BaseInstaller { protected $locations = array( 'plugin' => 'plugins/{$name}/', ); /** * Format package name to CamelCase */ public function inflectPackageVars($vars) { $vars['name'] = strtolower(preg_replace('/(?<=\\w)([A-Z])/', '_\\1', $vars['name'])); $vars['name'] = str_replace(array('-', '_'), ' ', $vars['name']); $vars['name'] = str_replace(' ', '', ucwords($vars['name'])); return $vars; } } Save