: Ensure you have every single part of the set (part1 through whichever the final number is) saved in the same folder on your computer.

: If prompted for a password, it is usually provided by the source where you obtained the download.

: If you get a "CRC failed" error, it means one of the parts (possibly part 4) is corrupted. You may need to redownload that specific segment.

: If the software asks for "the next volume," make sure the naming convention is identical for all parts (e.g., they all start with "Transfusion4kkk").