I had the same issue.

Go into windows and search for the 'Apps and Features' Page. Look up Synapse 3 (Or find it), and click the uninstall button. It should come up with a window that asks if you want to uninstall, modify or repair. Click the 'Repair' button, and let it do its thing. It should ask for you to restart the PC when it is done reinstalling Synapse, and just do that and you should be all set.



If none of that shows up or doesn't work, uninstall Synapse 3 fully and then reinstall it from the site again.

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