For the +-25 early users that download the plugin free version before.
Please download the latest version and replace manually the old plugin.
There was an issue with Freemius setting (the version management system, handling version and Free/Preimum setup).
It was occasionnlay blocking peoples from upragding the pluign the in Plugins page list, and probably blocking partly the usage of the plugin.
Yopu need to redownload it here https://wordpress.org/plugins/bo-wc-customer-review-watson/
and replace manually the file (see here how to https://www.youtube.com/watch?v=PzRXF6qGrGQ )