Symptoms
When trying to install or uninstall Office Timeline, you keep getting prompted to close PowerPoint even though you know you’ve already closed it.
Overview
The Office Timeline add-in requires Microsoft PowerPoint to be closed during the installation.
In some cases, even if PowerPoint looks like it’s closed, there may be a residual process still running in the background that you need to manually end as described below.
Solution
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Open Task Manager by pressing Ctrl+Alt+Delete
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Locate Microsoft PowerPoint in the Processes tab
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Right-click and select End Task
