Selbes Problem auch mit der Version 4.4 LTS:
	Code:
	$ C:^\XAMPP^\php^\php.exe "-q" "C:/xampp/htdocs/web/contao-manager.phar.php" "composer" "install" "--prefer-dist" "--no-dev" "--no-progress" "--no-suggest" "--no-ansi" "--no-interaction" "--optimize-autoloader" 2>&1
Loading composer repositories with package information
Installing dependencies from lock file
Nothing to install or update
Generating optimized autoload files
contao/manager-plugin: Generating plugin class...
contao/manager-plugin: ...done generating plugin class
> Contao\ManagerBundle\Composer\ScriptHandler::initializeApplication
 Added/updated the web/app.php file.
 Added/updated the web/app_dev.php file.
 // Clearing the cache for the prod environment with debug                     
 // false                                                                      
 [OK] Cache for the "prod" environment (debug=false) was successfully cleared. 
 // Warming up the cache for the prod environment with debug                   
 // false                                                                      
 [OK] Cache for the "prod" environment (debug=false) was successfully warmed.  
 Trying to install assets as relative symbolic links.
 --------- ------------------------ ---------------- 
            Bundle                   Method / Error  
 --------- ------------------------ ---------------- 
  WARNING   ContaoCoreBundle         copy            
  WARNING   ContaoFaqBundle          copy            
  WARNING   ContaoNewsBundle         copy            
  WARNING   ContaoNewsletterBundle   copy            
  WARNING   ContaoCalendarBundle     copy            
  WARNING   ContaoCommentsBundle     copy            
 --------- ------------------------ ---------------- 
 ! [NOTE] Some assets were installed via copy. If you make changes to these    
 !        assets you have to run this command again.                           
 [OK] All assets were successfully installed.                                  
 Added/updated the system/initialize.php file.
16:34:50 ERROR     [console] Error thrown while running command "contao:install --env=prod". Message: "Unable to create symbolic link due to error code 1314: 'A required privilege is not held by the client'. Do you have the required Administrator-rights?" ["exception" => Symfony\Component\Filesystem\Exception\IOException { …},"command" => "contao:install --env=prod","message" => "Unable to create symbolic link due to error code 1314: 'A required privilege is not held by the client'. Do you have the required Administrator-rights?"] []
In Filesystem.php line 391:
                                                                               
  Unable to create symbolic link due to error code 1314: 'A required privileg  
  e is not held by the client'. Do you have the required Administrator-rights  
  ?                                                                            
                                                                               
contao:install [-h|--help] [-q|--quiet] [-v|vv|vvv|--verbose] [-V|--version] [--ansi] [--no-ansi] [-n|--no-interaction] [-e|--env ENV] [--no-debug] [--] <command> [<target>]
Script Contao\ManagerBundle\Composer\ScriptHandler::initializeApplication handling the post-install-cmd event terminated with an exception
In ScriptHandler.php line 113:
                                                                               
  An error occurred while executing the "contao:install" command: 16:34:50 ER  
  ROR     [console] Error thrown while running command "contao:install --env=  
  prod". Message: "Unable to create symbolic link due to error code 1314: 'A   
  required privilege is not held by the client'. Do you have the required Adm  
  inistrator-rights?" ["exception" => Symfony\Component\Filesystem\Exception\  
  IOException { …},"command" => "contao:install --env=prod","message" => "Una  
  ble to create symbolic link due to error code 1314: 'A required privilege i  
  s not held by the client'. Do you have the required Administrator-rights?"]  
   []                                                                          
                                                                               
  In Filesystem.php line 391:                                                  
                                                                               
                                                                               
    Unable to create symbolic link due to error code 1314: 'A required privil  
  eg                                                                           
    e is not held by the client'. Do you have the required Administrator-righ  
  ts                                                                           
    ?                                                                          
                                                                               
                                                                               
                                                                               
                                                                               
  contao:install [-h|--help] [-q|--quiet] [-v|vv|vvv|--verbose] [-V|--version  
  ] [--ansi] [--no-ansi] [-n|--no-interaction] [-e|--env ENV] [--no-debug] [-  
  -] <command> [<target>]                                                      
                                                                               
install [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [--no-suggest] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--ignore-platform-reqs] [--] [<packages>]...
# Process terminated with exit code 1
# Result: General error