I can't open the zip files from the course. Computer says files can't be read.
Maybe you got a bad download? I'd suggest trying it again.
If that doesn't work, try downloading directly to a thumb drive.
This is a windows computer? What software are you using to unzip with?
A lot of people have had issues with these zips because they're "split zip archives" (.zip.XXX) and not regular .zips. Information about this is scattered about but the best place for instruction right now is the documentation section of the blender market product page.
@theluthier on Linux, I found the easiest way is to combine them into 1 .zip file (with the (con)cat(enate) command):
Then you can unzip that single .zip file with your standard tool.
This principle/trick should also work on other OSs, I think. Windows Powershell even supports 'cat' if I'm not mistaken.