Finding your SketchUp Pro 2017 credentials can be a bit of a headache, especially since Trimble (the developers) moved toward subscription models years ago.
Trimble provides an online License Manager where you can look up your serial number and authorization code. Go to the SketchUp License Lookup page. Enter the email address used for the original purchase. sketchup 2017 serial number and authorization code
Add License: Click the Add Classic License button (ensure you are on the "Classic" tab, not the "Subscription" tab). Finding your SketchUp Pro 2017 credentials can be
When you install SketchUp Make 2017, it starts as a 30-day trial of "Pro." sketchup 2017 serial number and authorization code