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Let me make something clear about pUnity so people don't get trouble using it.

1. pUnity doesn't work for every unity games. Only 5.5.x games are supposed to work with pUnity.
2. pUnity can't search for archives in your games which means you can't use it in a method chain (Ex: pUnity+msc+srep+lolz), that's not possible at all. You need to use seperately on unity archives.
3. Always verify your files
4. If you want to implement it in a real repack installer, you need to include a bat/cmd file or something like that to restore files and you may need to use ISExec to show progress and xdelta to keep crc as Razor12911 said
5. Using the correct liblz4.dll that was used for compression in the first place could fix crc mismatch and the xdelta part can be skipped.