2

avast isn’t blocking/flagging the site at all.
But there sure are things that need to be solved/fixed.

Outdated plugins :
magic-liquidizer-responsive-table 1.0.9 latest release (2.0.0) Update required
http://www.innovedesigns.com/wordpress/magic-liquidizer-responsive-table-rwd-you-must-have-wp-plugin/

siteorigin-panels 2.5.9 latest release (2.5.11) Update required
https://siteorigin.com/page-builder/

all-in-one-seo-pack 2.3.15.3 latest release (2.3.16) Update required
https://semperplugins.com/all-in-one-seo-pack-pro-version/

The first two user ID’s were tested to determine if user enumeration is possible.
ID User Login
1 None admin
2 None

Directory indexing is enabled !

Vulnerable library used :
http://retire.insecurity.today/#!/scan/97d1b4c02470e72e87a3c0dfda5f79cb48937e17bad829ffa72c7b47ccb41fe6

And remove the hidden link !
https://quttera.com/detailed_report/mejorcasinoonline.es