Hello, Kultakuume,
Thank you for reaching out to us with your query regarding the PHP version update for your site.
parse_str(), openssl_free_key are fixed in 6.4.5 version.
However, please be aware that the error related to libxml_disable_entity_loader persists. Although this function is present in our plugin, it is a replication of a WordPress core file, which WordPress has not yet addressed.
We hope this information is helpful.
Best Regards,
8Theme’s Team