@Ayamjago56 The error you're seeing is generic and doesn't necessarily have anything to do with why the download fails. For example, you might not have installed an expansion or stuff pack this sim uses, or the download itself could have been corrupted.
Please try installing the sim in a clean user folder. Move the entire Sims 3 folder out of Documents\Electronic Arts and onto your desktop, open the launcher to spawn a clean folder, and download a fresh copy of the sim. Let me know whether it works.
@puzzlezaddict it still fails and says the same reason as before. Not sure why this happened
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