Sounds like one of the SFX folders got corrupted in transit somehow. Here's an alternate way to download the PC version:
https://drive.google.com/file/d/11e3U9isLFmuouWmX-ULTM9rAV8WXOsuv/view?usp=shari...
Thankfully, this build will be taken down within the week, and Chapter 5 will be the public version starting on 11/26. Let me know if the Drive version still gives you issues.