Thanks djr for the rollback advice. I’m now back to the previous version and I’m not getting the error messages that everyone noted.
But yes, I’d like to add that I also received the same errors. And when I initially tried to deactivate the plugin it went to a page showing nothing but the two error messages. After hitting the back button on the browser I then noticed that the plugin was successfully deactivated after which I carried out the re-install of older version.
Thanks again. Looking forward to the fixed updated.