It was also published as a realtime JUCE project, which might be more useful for actual (realtime VST/AU) use:
https://github.com/damskaggep/WaveNetVA
Alec Wright has done more work on this since then, using it for amplifiers:
https://www.aalto.fi/en/news/deep-learning-can-fool-listener...
And time variant effects:
https://github.com/Alec-Wright/NeuralTimeVaryFx