: Search your inbox for "SketchUp License Information" from trimble.com or sketchup.com .
You can find your Serial Number and Authorization Code through the following methods: sketchup 2016 license key and authorization code
⚠️ : Avoid "keygen" or "crack" sites claiming to offer 2016 codes; these are high-risk sources for malware and will not provide a legitimate authorization. If you'd like, let me know: Do you still have the original installation file ? Are you trying to move it to a new computer ? Is this for personal use or professional work ? Classic License Errors - SketchUp Help center : Search your inbox for "SketchUp License Information"
: In the dialog box that appears, ensure the Classic tab is selected. Are you trying to move it to a new computer
Back in 2016, SketchUp Pro operated on a "Classic License" system. Unlike today’s sign-in method via a Trimble ID, the 2016 version required two specific strings of characters to activate: