Hello,
Unfortunately, we don’t speak Spanish.
Watch the video tutorial on how to install theme https://youtu.be/4n1re0jKorc
Before this make sure that Upload max filesize meets theme requirements https://xstore.helpscoutdocs.com/article/60-xstore-theme-requirements
If everything is ok but you still have the mentioned issue then provide us with WP Dashboard and FTP access to your site. We’ll help you with theme installation. Tell us if you want to install any demo content.
Regards