Yes, it's 100% compatible with Windows 10 Anniversary since that is what I put on his laptop. The Anniversary update is just a service pack update like in Windows XP and Windows 7. They just don't call it that. I read somtgat Microsoft will be removing the number from Windows and just make continues updates so we will not have to worry what version we would have anymore. But everyone would have to have Windows 10 for that to happen, that is why they gave the everyone a year of free upgrade which ended July 29th.