All of my current and future NAM models are 100% free of charge. They are my gift to the community since I enjoy the process and it can be done silently with a load box.
If you would like to have the sound of my speaker cabinets and to support my work, please consider purchasing an Impulse Response pack. They make loud noises during recording, so they have to cost a little money ;)
https://www.etsy.com/shop/studiohelga