I want to know what the heck is going on here. The rest all give me a debug error before they're a quarter of the way loaded. The ONLY one that actually loads completely and allows me to play is the Riverblossom Hills remake. They all show up in-game once the files are moved to Nonpackaged/Worlds. I have Riverview, bought from the store, a remake of Riverblossom Hills from here at modthesims, another world downloaded from here, and one from the Exchange. Here's where things get stranger, and where I need help to really understand what is going on and, more importantly, what to do. They all showed in the drop down, and I thought 'Haha! I have outwitted you Sims 3!' Not so much. world files into the Game Data/Shared/Nonpackaged/Worlds file. When I found the above linked thread, I tried all the suggestions within. world files, but they do not show up in game under the drop-down for new game options.
They install fine according to the launcher, the worlds show up in the Installed World file as. No amount of uninstalling, redownloading, and reinstalling fixed this issue. My issue was first that any custom worlds, whether downloaded from here, the Sims Exchange, or from the shop would not show up in the game. Unfortunately, it was archived, and I assume closed, before any sort of fix was found. It is the only one that has helped me with my issue. Before I begin, I'd like to link to this page.