This is the English part of Microsoft Q&A. For questions in Portoguese, I suggest that you go to https://learn.microsoft.com/pt-br/answers/questions/ask/.
You cannot restore a backup from an newer version of SQL Server to an older. You need to install SQL 2019 to restore that backup. If you want that database on your SQL 2016 instance, you need to script it and copy the data manually. Beware that the database may be using features not supported on SQL 2016.