For versions 2023 and newer, use your email and Sign In . Serial numbers are for legacy "Classic" versions only.
For a quick look at the new Flip tool and other 2023.1 updates: New Features in SketchUp 2023.1 | What's New? Sketchup Guru YouTube• Sep 21, 2023 To see the new Flip tool in action for symmetry and copies: sketchup pro 2023 license key new