Hi,
Generally, once a file is corrupt, it's gone. So what I'd do, is just recreate the changes using one of your slightly older versions of the file. This time taking care to make sure you know exactly which one you're editing. Maybe saving a copy to a USB flash drive in addition to uploading a copy somewhere.
Use PowerPoint Repair Toolbox. The PowerPoint repair tool reads and analyzes the damaged files and exports data the restored data to Microsoft PowerPoint. For more:
PowerPoint Repair Toolbox
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