Those who have not already upgraded to Windows 10 will now have to pay £99.99 for the privilege.
For those who have upgraded, they get the AU for free.
It won’t be available to everyone straight away, but will be rolled out gradually over the coming days.
Here’s how to get the Window 10 Anniversary Update:
Firstly, the upgrade only works for Windows 10, so those who are still using Windows 7 or 8 will need to the make the leap first, before installing the add-on update.
Secondly, users need to make sure that their computer is up to the job – the update requires a minimum 2GB of RAM and 16GB of hard drive capacity.
Computers should be backed up before the update is carried out, just in case anything goes wrong.
The mobile version of the update is available for devices measuring up to 9 inches, while on desktop, it can be applied to devices as small as 7 inches.
Those who have enabled automatic Windows 10 updates when installing the software should see a prompt to download the Anniversary Update as soon as it is available.
To turn on automatic updates, head to the Start Menu, then Settings > Update and security > turn on automatic updates.
For people who do not have automatic updates enabled, they will need to manually install the update.
To do this, they can simply head to the Start Menu, then click on Settings > Update and security > Check for updates.
As soon as the update is available, users will be able to download it from here.