* Presentations are in compressed "zip" files. After download, double-click the zip file to unload the presentation in powerpoint or keynote format, then double-click the .pptx or .key file to open in presentation software on your machine.
* If you see a 'file needs repair' message, click ok to repair - a repair confirmation will come up, and you'll be able to proceed. If this fails, see this tutorial for correcting the issue:

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