I managed to get the PWM library working with IDE 1.6 by doing the following:
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Download and unzip Arduino PWM Frequency Library v-05, here you will find three folders, "PWM", "PWM_lib_example" & "PWM_lib_resolution_example". Move the the two example folders into the PWM folder.
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The go to C:\Program Files (x86)\Arduino\libraries and copy the "PWM" folder here.
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When complete your libraries folder should look like the attached picture.
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Restart the ide and PWM should now be available in your list of libraries.