That means you are doing something differently…
Close your SketchUp, then reopen SketchUp, then :
Follow the guide exactly as written.
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However, there is an other method that can work better for you. It is again essentially to follow exactly as I wrote, nothing more nothing less.
Close your SketchUp, then reopen SketchUp.
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Select the menu with mouse: Extensions>>Extension Manager
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Hold down the ⊞ Win key and Shift key together.
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While you still holding above keys Hit the → right arrow key several times until the Extension Manager windows appears
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Release all keys
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(You can do the same if the first step is selecting the menu with mouse: Extensions>>Extension Warehouse)
Ps. The method also works if you only hold the ⊞ Winkey and hit the →right arrow key several times, the most important is to do not click with your mouse or do not hit other keys as written after selecting the Extension Manager menu.