Upload/Download in WEBGUI using Google Chrome 45 or higher.
Since Google removed the NPAPI from Chrome, the Java Applet used to perform download/upload operations cannot be used any longer.
A new approach is available as of SAP note 2208040. Now it is available the WEBGUI File Browser:
For more details about the use of the WEBGUI File Browser, please read KBA 2249454.