The feature "Repair Archive" of Bandizip only supports a single ZIP archive. If your corrupted archive is a split ZIP archive, or if you need to make a split ZIP archive into a single archive without re-compression for other reasons, you can merge the split ZIP archive manually with simple commands.
Split-compression in the ZIP format creates files with the extension "z01", "z02", ... and one with "zip" as shown below.
Open the Terminal, move to the file location, and run the following commands.
cat sample.z01 sample.z02 sample.zip > merge.zip
You can find that the "merge.zip" archive has been created as shown below. You can open the merged archive or start to repair the archive.
The archive which has been merged via this method may fail to be opened, or may display an error message.