In version 5.5 the “Empty” emitter has been renamed to “Minimal emitter”.

• So as we go through the course, you’ll want to right-click inside Niagara and select “Add minimal emitter”
• After enabling temperature, you now need to go to the Render tab and set temperature rendering to “Black Body” for fire to show up
• if the “Draw Bounds” button isn’t working, it’s because the draw bounds override is enabled by default in the “Quality Override” tab inside Emitter Summary

No further significant changes in 5.5. You’re good to follow the course as is.