That looks like a ready to use C++ plugin built with JUCE. Just throw it in the compiler and enjoy :)

You might want to ask for the Projucer file to so that it creates the project for your IDE.

@mwplugs Do you have auto makeup turned on? I found that the output is way too hot, so I updated the math in another thread.
Also, when the attack and release values are set too low, the signal will have terrible artifacts. I wouldn't use anything lower than .1ms there