Today Microsoft started their global rollout of Update 1 to Windows 8.1. The update, which basically makes Windows 8.1 more user friendly for traditional desktop users, are being made available through Windows Update.
The update itselft is tailored to the type of machine you have, it being a desktop, a laptop (touch or no touch) or a tablet. On my current laptop, which is no-touch, the total download was around 900 MB, and the update process took approximately 10 minutes total.
Interested in updating? Go to Windows Update and check whether it is available for you yet. Good luck