This isn’t actually related to an update of Event Espresso, but folks do tend to notice issues like this one after an update. The “this registration could not be completed. please refresh the page and try again” is a generic error message that’s related to a problem with the AJAX request when the registration form is submitted.
Can you check the site’s PHP error log for a fatal error at the time the registration form was submitted? If you do not have access to that error log, you can set up WordPress to log errors by following this guide: https://eventespresso.com/wiki/troubleshooting-checklist/#wpdebug
Once we have that error message we can move forward with a solution.
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