Windows 10 has already been installed on well over 350 million machines according to the Microsoft. If you're not already running Windows 10 then here is the guide on how to upgrade to Windows 10 for free. So, how those already running Windows 10 can install today's anniversary update? 

First, you have to note that the free upgrade to Windows 10 offer has now expired, and Windows 10 Home is costing £99.99 while Windows 10 Pro is coming for £189.99. However, there is still a way you can get Widows 10 for free we will show you that.

The free offer has ended for the general public but there is still a way of getting Windows 10 for free. Microsoft has kept the upgrade deal open for the users of assistive technologies, at least partly as the Anniversary Update brings quite a few improvements in this area.

According to the PC Advisor, this does not meant as a workaround if you didn't upgrade by the 29 July deadline and now want Windows 10. Though as there appears to be no verification as to whether you use any of Windows' assists or not, it is possible that now also you can get upgrade for free.

Follow the link above and click the 'Upgrade Now' button to run an executable file that enables the upgrade to start.

If you just want to upgrade straight away, then check out the Download and Install Windows 10  from Wccftech.

To run the Windows 10 Anniversary Update you will need a PC with minimum 2GB of RAM and 20GB of internal storage that's for 64-bit, for 32-bit you'll need 16GB.

The desktop version will run on devices with screens larger than 7inches, while the mobile version works with devices that have screens up to 9inches. If your PC is already running Windows 10 then it will run the Anniversary Update.

Turn on automatic updates to receive the Anniversary Update by going to Start, Settings, Update and Security and turning on automatic updates.

You can also manually check for the Anniversary Update by going to Start, Settings, Update and Security, Check for Updates.