Unable to load on Google Sheet
"Google is suffering from issues with all Sheets Add-ons, which causes Supermetrics for Google Sheets not to launch.
We've contacted Google, and got feedback that they're working on fixing the issue.
Please star this issue on Google's Issue Tracker, to make sure they note the problem is widely spread and prioritize fixing.
Very sorry for the inconvenience. We'll update the situation here when services are restored."