Hey @Arsh ,
Glad to see you got it working now.
The zip files for the HUMAN course are known as split archives. These are used to preserve the file structure of the unzipped files.
Because there are a lot of files, mostly .blends with external links to textures, reference images etc., split archive zip files maintain these links.
These split archive zip files however, do need to be unzipped slightly differently than regular zip files.
See human-realistic-portrait-creation-more-info, this thread explains the process and lots more.
Enjoy, HUMAN !
