Hi alexliii,
Thank you for your report. I confirmed the Google popup is working and there have been no changes to the functionality of the Google integration in over 6 months.
I recommend verifying your configuration under “Google Review Prompt” in the plugin settings. It should have the checkmark on checkout confirmation, your Google Merchant ID, and the placement of the popup. I would also check that the popup is not suppressed or hidden by any elements in your theme on the confirmation page and there are no conflicts on the confirmation page (please check the F12 dev tool console).
Lastly, verify your configuration at https://merchants.google.com/mc/customerreviews/configuration (you must be logged in). The plugin only places Google’s short script on the confirmation page when enabled, so if you find everything else is working, I recommend reaching out to Google to help further troubleshoot your setup.