How to install:
Windows
Run the setup
Mac
Put FreePiano3.component to /Library/Audio/Plug-Ins/Components
Open Daw (e.g Logic Pro). Load the Plugin. Now close it.
Install Library
Put all .rda1 files to
Users/<UserName>/Music/RDGAudio/Free Piano 3/Samples
Relaunch DAW and Run the Plugins.