Hello Fernando,
Thank you for getting in touch with us.
Enable debug mode in WordPress – https://wordpress.org/support/article/debugging-in-wordpress/ to find out what error appears on your site, it will point you in the right direction what needs to be fixed.
Please provide us with FTP access.
To create FTP access (FTP host, FTP username, FTP password, FTP port, FTP encryption) , please contact your hosting provider for assistance.
Best Regards,
8Theme’s Team