The "good" news is that only the TOC (info of archived files) is encrypted so you can still extract all the files without name by editing the following variables in the script:
math NO_TAIL_INFO = 1
math VERSION = 4
With the Friday The 13th: The Game engine update, it seems like they have encrypted the pak in some way as it cannot be unpacked with quickbms or umodel. When trying to extract the game, quickbms asks for an encryption key. I don't have one so I press enter, then it just hangs.
I also tried the fixes mentioned in the quote, it extracts about 17 0kb dat files before showing this: "Error: the compressed zlib/deflate input is wrong or incomplete (-3)" and "Error: the uncompressed data (-1) is bigger than the allocated buffer (65536)"
I'm wondering if you would be able to find the encryption key (presumably AES) from the games exe. I have looked for ages in IDA and I cannot seem to find it as it's just not my level of expertise.
With the latest patch, they accidentally uploaded a dev build. They pulled it but was already too late and I managed to save the dev build. I hereby provide you with the dev build exe, completely unlocked, no obfuscation whatsoever AND it's PDB file. I'm assuming the key would be the same for the dev and shipping builds and I thought it would be easier for you to find the key with the PDB.
Link to files: https://drive.google.com/drive/folders/1WrRcUpX5Rpv7VjJMWSLeKV3YvNcxleck