SketchUp has moved to a subscription model. If you need the latest Pro features, checking their current plans is the only way to get a guaranteed working license [1, 2]. Do you still have the email address
on their official site. You will need your serial number or the email address used for the purchase to retrieve your codes [1]. 3. Consider the Free Version Sketchup Pro 2016 License Key And Authorization Number
(web-based) is a great alternative that doesn't require a license key. 4. Upgrade for Modern Features SketchUp has moved to a subscription model
Since 2016 is an older version, it no longer receives security updates or support for 3D Warehouse. If you just need to model for personal use, SketchUp Free Sketchup Pro 2016 License Key And Authorization Number