Another word of warning before you proceed with installing the Anniversary Update for Windows 10—you only have 10 days to decide if things are working out or whether you want to roll back to a previous build. After 10 days, Windows 10 locks you into the Anniversary Update for good, whereas previously Microsoft allowed 30 days to evaluate things.

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Source: Hot Hardware – Windows 10 Anniversary Update Allows Only 10 Days To Revert Back To Older Windows Versions