On any server you should be able to locate the log at default location storage/logs/laravel.log . And that inside the directory where the application is stored so with a Ploi or Forge provisioned one at ~/site.com/storage/logs/laravel.log
You can download it using SFTP or just ssh into the server and use tail -n 100 ~/site.com/storage/logs/laravel.log to check if from the terminal.