Hey PacoRuiz,
Since you are new to UE4 you might not yet be aware of our documentation site. Take a look at our ‘Troubleshooting Launcher Problems’ guide on our Wiki to see if the suggestions help resolve your issue.
Unreal Documentation
Troubleshooting Launcher Problems
https://wiki.unrealengine.com/Troubleshooting_Launcher_Problems
Use these resources, along with AnswerHub, to help find answers to your questions in the future as well!
Cheers,