If you do not have an existing license for the 2019 version, consider these current options:
To activate an older version, log into the Trimble Account Management Portal to manage your classic serial numbers or subscription seats. Download Creaaaaaaak Sketch Up2019 rar
If you already own a classic perpetual license or have an active subscription, you can still download SketchUp 2019 safely: If you do not have an existing license