If you are missing even one segment (e.g., you have 1, 2, 3, and 5, but not 4), the extraction will fail.
Fragmented Files: Understanding the .7z.001 to .00X Sequence YourPizza.7z.005
Ensure you have YourPizza.7z.001 , YourPizza.7z.002 , and so on, up to the final number in the set. If you are missing even one segment (e
alone; you must have of the sequence in the same folder. you have 1
This usually means one of the parts was corrupted during download. You may need to re-download the specific segment that is throwing the error.