I have just done the download again (uninstalled the Download Manager, deleted the previously downloaded zip file, then reinstalled and re-did the download). That was successful and the file validation completed successfully.
I then spent 2.5 hours unzipping to a 64GB USB stick (FAT32) and got exactly the same problem as previously...completes 100% and then reports Unzip0088 error.
So, still really puzzled (and frustrated!)
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