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?

@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.