Our detectives are back with the following intel on this WordPress site
The site is using two themes, one child and one parent. The child theme is based on the parent and often custom to the site. The parent theme is Reverie theme by Zhen Huang .
We could identify 6 plugins (there might be more) - aim-featured-content , Footer Pop-Up Banner , instagram-feed-pro , W3 Total Cache , Yoast SEO and yogajournal-instagram-widget
Child theme for the Reverie, will not work for previous version, probably :)