Re: [CURRENT ISSUE] Sims 4 DLC shows as installed, won't load in-game
I had to competely reinstall sims again on my computer, because trying around with the app broke my setup (always opened the app in the workarounds, not through steam, which didn't let the game launch), and now this problem is resolved. It showed me the pop up for the kit and all the content is there in the game. Since I only tried getting the app to work independently after this, and could not do so before, that can't have been the problem. So I still don't know what the issue was but it fixed itself.
But thanks for trying to help!