Since you couldn't be bothered to actually ask a question, why should we bother to respond? The error message says it all... It's plainly obvious. You're trying to install a package that requires Laravel 4 and Laravel 5 at the same time. Perhaps you should try to install version 0.3 of barryvdh/laravel-elfinder that actually requires Laravel 5.
Edit: seriously? You got your answer to this already! http://laravel.io/forum/02-02-2015-laravel-4-package-install-l...
Stop posting junk and read what people are telling you.
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