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Quttera doesn’t say the domain/IP is blacklisted by avast, it just says it is found in one or more blacklists and that is true.
And Fortinet for sure is a major list.
https://virustotal.com/en/ip-address/89.40.36.81/information/

Using the “replacing kit” method is not working as WP does’t come with the latest jquery libraries.
jQuery 3.2.1 is the latest version.

On a note, the certificate is about to expire (1 month and 5 days).