Hey @zeriel , thanks for writing this up! Indeed, this lesson is intended for 2.7 and not 2.8. We’ll be replacing this course with an updated one once 2.8 is released. We’ll also be more mindful of pacing, so we don’t rush through things too fast.
For baking in Cycles, the active image is the one that’s selected in the node editor, so be sure that your image texture is in the material and is the selected one.
I wouldn’t worry about this tutorial if you’re set on using 2.8 – feel free to skip it. I hope that you did learn some things along the way and that the frustration wasn’t wasted. If you have any other questions or find roadblocks in the course, don’t hesitate to @ tag me in a question or to ask in the Community where everyone can chime in with thoughts / encouragement.
P.S. We’re changing the questions system soon so that it doesn’t take so long for someone other than the author to find unanswered questions like this. More on that soon.