SketchUp 2019 is technically "end-of-life." This means it no longer receives security updates or compatibility patches for new hardware. The Modern Alternative: SketchUp Pro Subscription
This guide covers everything you need to know about the 2019 Classic License, the transition to subscriptions, and how to access SketchUp legally today. What was the SketchUp Pro 2019 Classic License? sketchup pro 2019 classic license free
If you previously purchased a license and simply need to reinstall it: Visit the SketchUp License Manager. SketchUp 2019 is technically "end-of-life