Totally agree with “no harm in redoing”. I’m enjoying these lessons very much and personally I’d like to see more of them. Too bad I’ve missed that august course with texturing/baking practical routine. Hope CG will implement it as a part of 2.8 flow later on.
As for various versions, yes, I had 2.79 and 2.80, but pretty soon there was only 2.80 left. And when I tried to install 2.79 again (yesterday, to complete that lesson) I had some “there is a higher version of that program” pop-up.
Anyway, it’s all good now, thanks!