Hi

I disabled the plugin on my site, the WP HTML MAIL plugin does not allow to register the product in the cart.
My Woocommerce v. 3.8.0, WordPress 5.3.

When I disable everything works

I bought the plugin extension (WP HTML EMAIL WOOCOMMERCE) for a site in August 2018, but I can’t update

The page I need help with: [log in to see the link]