Uploading or emailing large files is prone to failure. If a 500MB segment fails during an upload, you only need to re-upload that specific segment rather than the entire multi-gigabyte file.
If the extraction stops midway, one of the segments (like your .002 file) may have been corrupted during download. You may need to redownload that specific part. B10209.7z.002
You cannot open a .002 file in isolation. To access the data inside, follow these steps: Uploading or emailing large files is prone to failure
Understanding the B10209.7z.002 File: A Guide to Multi-Part Archives B10209.7z.002
If you are missing a single segment, the extraction will fail. Ensure you have the full sequence.