for testing I placed the zip file on my download page: http://v2-powerpoint.de/download/
When I click the link to the zip file: http://v2-powerpoint.de/wp-content/uploads/2016/05/basic-dark-6-1a.zip
it downloads and unzipping is no problem.
So I created a new zip containing a picture (jpg) an placed it on a new etd post. After downloading the file per mailed link the file is corrupted. The same problem as before. If you check with 7-zip it says (check archive) “There are some data after the end of the payload data”
Donald from Germany