Start by opening on the top menu bar the Window > Package Manager In the new window on the top left corner click on the + sign and select Import via git URL and paste ...
When I import Facebook Unity SDK in my game, I get this error: `Gradle failed to fetch dependencies. Failed to run 'C:\Unity\Bubble_s Valley\Temp\PlayServicesResolverGradle\gradlew.bat --no-daemon -b ...