I purchased the "Eo colture" lesson but I can not open it... What should I do?
This is an issue a lot of people are having. Personally, I bought the culture skill a few months ago and still can't access it. You used to be able to access the course via its direct link instead of through the skill tree, but within the past week or two they've removed that ability as well. At present, there's no way for those of us with this issue to access that topic. We'll all just have to keep waiting until a fix arrives. Don't cross your fingers, though. Like I said, I've been waiting a couple months. This is either an extremely complicated fix, or it's just not high priority for Duolingo (or whoever is in charge of fixing it). My advice is to forget about it and just enjoy the rest of the course. ☺️