Can't find ? IsValid node

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When I search for this node it is not appearing in the results. Does anyone know if this is a bug or how I can fix this?

Perhaps you deleted the macro by accident?. Try verifying your Unreal Engine install from the epic launcher.

I got the node now. I verified UE but I think I couldn’t find the node because I skipped over something while following a tutorial that I needed to do first. Anyway, thank you!

I know this is coming a bit late, but can you please tell me exactly what you did? I’m having the exact same issue.