Sometimes you can encounter an error during unpacking. Here is the short checklist of things to do:
1. Make sure you downloaded all files correctly - the most errors come from incomplete downloads. re-download if you can.
2. If files are packed with RAR extension, use WinRar: https://www.win-rar.com/start.html?&L=12
3. If files are packed with 7-zip, use 7-zip free archiver to unzip files: https://www.7-zip.org/
4. To unzip 7-zip files you need to unpack only the first file (with .001 extension). Files with .002 and higher extensions are unpacked automatically.