Install the latest 15.xx version of Office for Mac 2016. In Safari, re-download the Office app or apps you just deleted. The links below will download the last production-ready 15.xx version of the app(s).
PowerPoint for Office 365 PowerPoint 2019 PowerPoint 2016 PowerPoint 2013 PowerPoint 2010 PowerPoint 2007 If you've arrived at this article because you got an error message that PowerPoint can't read a file or that the presentation cannot be opened, it's likely that Office has blocked the file for security reasons. You can unblock the file so it can be opened:. Open Windows File Explorer (Open Start in Windows and type File Explorer.). Locate the problematic file on your computer.
Right-click the file and select Properties. In the Properties dialog box, look for an Unblock button near the bottom right. If it exists, click Unblock, then click Apply, and then click OK to dismiss the dialog box. Now, attempt to open the presentation again. Right-click the file in File Explorer and select Open. Still having trouble?
If you're having a problem with PowerPoint that's not resolved here, please for technical support. For a discussion about why Office blocks files, read.