I have again tried the downloads and all worked for me.
5 & 6 showed a directory of the files in the zip and I had to click the download icon in the top right corner to download the zipped files.
I amusing Firefox brouser on windows 10 (but not the latest upgrade as this stops the touch pad working on my computer)
Tried on another computer with the latest version of windows 10 ver 20H2 and for 5 + 6 I geta message “Coudn’t preview file There was a problem with the network. Retrying”
Using the download button displayed below this message does download the zip