Here’s how to test a multipart archive in Windows:
1. Download and install IZArc on your system.
2. Navigate to the folder where the multipart archive is located –
3. Right click on the first part of the archive and select ‘IZArc>Test’.
4. IZArc will start testing the archive and will show you the output of the test. By scrolling the log you can identify which file / part of the archive is bad. Thus, you can redownload only the corrupted part instead of all the parts of the archive. This is really useful when you get a CRC error while extracting a multipart archive.