Are you installing this on a new computer, or is this the first time activating it?

Before choosing to remain on a legacy 2020 version, keep the following infrastructure changes in mind:

Your serial number and authorization code will be displayed in the dialog box.

Using a cracked version of SketchUp Pro constitutes a violation of Trimble's terms of service and copyright laws. Unauthorized distribution and use of cracked software infringe on the intellectual property rights of the developers, leading to potential legal consequences for users.

This guide outlines how SketchUp's legacy licensing works, why Trimble transitioned away from serial numbers, the risks of using unauthorized activation codes, and how to properly manage legitimate legacy seats. What is a SketchUp Classic License?

Search your inbox for emails from SketchUpService@trimble.com or your local reseller. Look for keywords like "SketchUp Pro License Activation."

: Typically begins with letters (e.g., "WA-" for 2021 versions). Authorization Code : A unique alphanumeric string. Suddenly can't open my classic license - SketchUp Forum

This article explains how to manage your , how to find them, and how to authorize your software. What is a Classic License for SketchUp?

Since November 2020, you can no longer renew M&S plans or upgrade Classic licenses. If you didn't upgrade to 2021 while your plan was active, your 2020 key remains locked to the 2020 version of the software. How to Authorize Your Software