Failed to launch error when using CC

Honestly, I’m at my limit right now.

Since The Sims 4 first came out, I’ve bought pretty much every DLC, kit, and piece of additional content available. When it comes to marketplace items, I haven’t purchased any yet, but I’ve always been open to doing so if something felt worth it. I also regularly support modders who create high-quality content. I’ve invested a lot of time and money into this game simply because I genuinely enjoy it.

And through all of it, I’ve been patient. Every update, every bug, every mistake—I’ve put up with it.

But now, it just feels like all of that was for nothing.

All the CC (custom content) I’ve carefully built up since around 2015 is now completely unusable. It’s over 100GB of content, and I have no way of figuring out what’s actually causing the issue. Some items seem to work at times, and then suddenly they don’t.

I’ve already tried everything I can think of—installing hotfixes, repairing the game, and going through every troubleshooting step I could find. I’ve spent nearly five hours trying to fix this.

And the game still won’t even launch.

Just to be clear, I’m not using any script mods at all—not even MCCC. The only content I have installed is CAS and Build/Buy CC.