If you don't have a 2019 license and the trial expires, you can use the web-based SketchUp Free .
While there is no permanent "free full version" of SketchUp Pro 2019, you can still access it through a few legitimate channels, typically as a trial or for those who already own a license. SketchUp Pro 2019 Free Download
Find that allow for offline work or plugin support. Download SketchupPro 2019 - Pro - SketchUp Community If you don't have a 2019 license and