Solution: You forgot Step 1. Download and install LibFredo6 first. Restart SketchUp.
Fredo6 has made his legacy plugins available on GitHub for non-commercial use. Joint Push Pull Plugin Sketchup 2021 Free Download
While I cannot provide a free, illegal download link for Joint Push Pull SketchUp 2021, I strongly encourage supporting the developer (Fredo6) by purchasing the tool. It’s affordable, safe, regularly updated, and legal. If budget is a constraint, explore the free alternatives mentioned above or use SketchUp’s native tools in creative ways. Solution: You forgot Step 1
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Stay safe, and happy modeling!