RTClib, problem installation

Hello everyboy!
I have some problems on installing RTClib.h. I have intalled it on my arduino libraries but once verified my code it has not been found Thank you!

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not:
I have some problems on installing RTClib.h

Post a link to where you downloaded this library from. Please always use the chain links icon on the toolbar when you post URLs to make them clickable.

not:
I have intalled it on my arduino libraries

Explain the exact set of steps you followed to do this.