Also getting the unable to unzip error.
Unzipped and attempted to run from the folder - said a specific graphic was not in a folder - so I added the file to the textures folder.
Now gives me message that file is not available over in some temp folder - despite being available and running from the folder on my desktop.
Even tried putting the file in the folder - rezipping the file - renaming to capx.
None of this worked.
Frustrating for the student in my class who lost a weeks worth of work.
Any other ideas ?