I have windows 10 and when I try to DL the root cert it just downloads a file named download and not a zip like you'd expect, when I change the extension to .zip it shows the certs folder and then inside of there are two certs but with a .0 and .r0 extension, I've tried chrome/IE/FF and another windows 10 pc and the same thing happens.
I had the cert installed on my own Win7 box with no issues for reference.