In 90% of cases, solves the problem by redownloading the specific corrupted segment of the bigfile. If that fails, checking your folder permissions or disk space are your best secondary bets.
Older software ignores the "updated" flag that the newer version introduced. unable to open bigfile bigfile000 updated
The file might be corrupted, preventing it from being opened. This could be due to a variety of reasons such as unexpected shutdowns, disk errors, or faulty hardware. In 90% of cases, solves the problem by
md5sum bigfile* > checksums.md5
If your system crashed (blue screen, power loss) while the file was being written to disk, the file header might show an "updated" flag that doesn't match the actual file size. The software sees the flag but cannot find the data, triggering the "unable to open" safety lock. The file might be corrupted, preventing it from being opened