The template (or any other Facebook reporting for that matter) requires a third-party connector to link your Facebook Ads account to Google Data Studio. We have reviewed several third-party data connectors, and the best one we have found in terms of performance and price is PowerMyAnalytics.
This company charges your a monthly fee of less than $10 dollars per month, per Facebook Ads account. If you are an agency, they also offer volume discounts for multiple Facebook Ads account connectors. https://www.powermyanalytics.com/pricing/
PowerMyAnalytics has a 14-day free trial for testing. https://hub.powermyanalytics.com/trial
We have created a short video below on how to set up a PowerMyAnalytics account and a dataset with Google Data Studio.