fatal error

I'm trying to install this library and can't seem to. This is the error that I'm getting.

fatal error: utility/Adafruit_MS_PWMServoDriver.h: No such file or directory
compilation terminated.
Error compiling.

I followed the instructions on this page but didn't help - Using the Adafruit Library | Adafruit PCA9685 16-Channel Servo Driver | Adafruit Learning System

After extracting the files into the Arduino library folder, I open the Arduino IDE, I click on sketch, drop down to include library, the libraries drop down, but Adafruit_MS_PWMServoDriver.h is nowhere to be found, yet I see it in my library file in file explorer.

Any suggestions?

Thanks.....Antonio

yet I see it in my library file in file explorer.

Exactly which directory are the library files in ?
Did you stop/start the IDE after installing the library ?