If you are missing of a multi-part RAR archive, you cannot "generate" a functional replacement piece from scratch. Multi-part archives contain unique, sequential data; if one part is missing, the entire extraction will fail because the data stream is broken.
one of the other parts you do have (e.g., part3.rar ). Rename that copy to PNTHG4-G891080.part4.rar . PNTHG4-G891080.part4.rar
: Use a robust player like VLC Media Player to open the resulting file. VLC can often skip over the corrupted/missing section (where the fake part 4 was) and play the rest. 2. Extract with "Keep Broken Files" If you are missing of a multi-part RAR