Unable to unzip the Sketches from the Engineering kit course

Official Hardware Education Engineering Kit
1

In section 3 we need to download sketches to test the hardware.
These are saved as a .zip format but cannot be extracted.
The files are said to be "invalid".
I have tried adding them as a ZIP Library via the IDE to no avail. Version 1.8.5.
The file title looks to be in the correct format. Motor_test.zip
Scanned it with Sophos anti virus. No problems there. Contains 3 files 1.08 MB.
Tried to extract on a different computer (Windows 7 & Windows 8). No help.

Am I missing something obvious here?

2

Hello Philip,

We were unable to replicate your issue. Can you please retry extracting the files?

Thanks!