Open the "Files" tab in SlideSync:
Available files have a green frame.
Select the desired "green framed" file, which will open a new window. Click on the "Export" button highlighted in yellow.
If the export is started successfully, you will notice a "green banner" at the top of the screen:
As soon as the download is available, the button becomes blue and the name changes to "Download":
You can now download the file and save it locally.
The content is available for a limited period until the event is archived.