Yes you can do this. Create an embedded form in Mailerlite, and grab the HTML code (link in the form creation tool). Grab the form action from that code, and add it to the Widget just as you would following the steps for Mailchimp integration.
Also in the same boat – had to deactivate the plugin in order to even have any content on my site (all my products 404!).
Thanks for the fix! Updated the rating now.
I also saw this error. It’d be great to have a plugin update so I can integrate with my store
