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My first guess would be an issue with a mod. Either you've got one that's not updated for the EPs that added life skills or you've got two that are conflicting with each other. The quick way to find out is to make a
backup of your neighborhoods and then remove all your downloads and test in a vanilla situation. If your Sims can gain life skill when there's no CC/mods present, then you know something in there is causing the problem. If not, then you've got a different problem. That would be your first diagnostic step. Most likely, it is a mod -- something that changes how the game works, not CC like a custom object mesh or clothing mesh or recolors and stuff like that -- causing the problem. So, add those back in one-by-one, optimally, until you find the one that breaks the life skills. Once you have it isolated, you can try changing load order to see if that makes it possible for your Sims to gain life skill. If not, then you'll have to abandon the mod or find where you downloaded it and check to see if it's been updated.