I have tried installing the plugin - but it doesn't appear in the list. I can't find the option under Processing toolbar as there is no option for interpolation. The only way I can access this plugin is by searching in the tool box. I have tried reloading the plugins and switching them on and off but no luck I'm afraid. I was trying to run it with default values just to see what the result would be. I can create a heatmap using styles but I need the data for further processing, not just a visual display.