My extension (.rb ruby script) is grayed out in extension manager when I try to install it

I have an extension (which creates a new menu item); in SketchUp 2017 I would add it via Extension Manager, but in SketchUp Pro it’s grayed out so I can’t select it. I wonder if I need to compile it first? Or does it need some other structure? I haven’t been able to find a suitable guide, so any help will be gratefully received: thanks!

Oops, I found some instructions that worked: How do I make my Ruby script extension compliant? - #2 by eneroth3

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