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document updated 7 years ago, on Dec 11, 2016
The 600mb+ download you need    (download 1/2)
    http://www.microchip.com/mplab/mplab-harmony    (see "Downloads" tab)

How to install the MHC plugin (MPLAB Harmony Configurator) within MPLAB    (download 2/2)
    http://microchip.wikidot.com/harmony:mhc-installation

creating your first Harmony project
    http://ww1.microchip.com/downloads/en/DeviceDoc/MPLAB%20Harmony%20Tutorial%20-%20Creating%20Your%20First%20Project_v109.pdf

Oh damn, the Harmony framework is ONLY available for PIC32 devices.