Download the Installer: Go to the SketchUp website and download the installer for SketchUp Pro 2020.
Run as Administrator: Open the downloaded installer file and run it as an administrator.
Follow Prompts: Follow the on-screen instructions to complete the installation.
Install Additional Components: If you choose to install additional components like V-Ray for SketchUp, follow the specific instructions provided.
Restart Your Computer: It’s a good idea to restart your computer after installation to ensure everything is set up correctly.

Download the Installer: Go to the SketchUp website and download the .dmg installer file for Mac.
Open the Installer: Double-click the .dmg file to mount it.
Drag to Applications: Drag the SketchUp icon to the Applications folder.
Launch SketchUp: Open the Applications folder and double-click the SketchUp icon.
Security Prompt: If prompted, click “Open” to allow the application to run

To activate SketchUp Pro 2020, follow these steps:

Open SketchUp Pro 2020: Launch the application on your computer.
Sign In: You’ll see a “Welcome to SketchUp” window. Click on “Sign In”
Enter Your Credentials: A new browser window will open, prompting you to sign in using your Trimble ID. Enter your email and password
Complete Activation: After signing in, you should see a confirmation message. You can then close the browser window and return to SketchUp

If you encounter any issues or need to activate a Classic License, you can refer to the SketchUp Help documentation for more detailed instructions