Many "3000+" packs are compiled by users who scrape sounds from video games or commercial libraries. If you use these in a public project (YouTube, Indie Games), you risk Content ID strikes or legal action because "free to download" does not mean "free to use".
If you are looking for a specific ZIP file, these platforms are the most "workable" alternatives discussed by power users on Reddit: 3000 sound effect pack zip free download reddit work