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1

Hello, how can I add and display a tool (copy along curve ) in the program? Please help. Thank you.

2

You need to install an Extension:
https://sketchucation.com/pluginstore?pln=CopyAlongCurve

Installing extensions manually in SketchUp

If you download an extension via a web browser from a developer’s website, your extension is packaged as an .rbz file that you can install manually. Here are the steps you need to follow:

  1. In SketchUp, select Extensions > Extension Manager. The Extension Manager window appears.
  2. Click the Install Extension button.
  3. In the Open dialog box that appears, navigate to the .rbz file saved to your computer, select the file, and click OK (Microsoft Windows) or Open (Mac OS X).
  4. When SketchUp warns you about installing only extensions from trusted sources, click Yes to proceed and install your extension. (This assumes you do, in fact, trust the source of your extension.)

You may need to check this too:
https://help.sketchup.com/en/extensions-loading-policy