Sketchup Pro 2020 Classic License Key And Authorization Number Link -

Unlike modern subscriptions, these credentials validate your software directly through a dedicated activation server or an offline validation loop. How to Find Your Authorization Number and Serial Key

: SketchUp no longer sells or renews Classic (perpetual) licenses; all new versions require a Trimble ID subscription . Unlike modern subscriptions

If that email is long gone, you can retrieve your info through the official SketchUp License Manager Unlike modern subscriptions