If you’ve upgraded to Windows 10 version 1607 by using Windows 10 Update Assistant, then Windows 10 Upgrade Assistant that has installed the Anniversary Update gets left behind on your computer, which has no use after upgrade, you can uninstall it safely, here is how that can be done.
Uninstalling Windows 10 Upgrade Assistant after installing Anniversary Update
1. Open Control Panel > Programs > Programs and Features
2. Select Windows 10 Upgrade Assistant and click Uninstall/Change
3. Click on Uninstall for the Windows 10 Update Assistant to be removed.