If you are using Windows 10 , you just have to check for update and Windows 10 Creator Update will be available for you. In some cases, you might have some pending updates and you need to download and install them first and restart your PC (if required). In addition, Windows 10 Creator Update will be released in phases, so if it is not available today, don't worry. You need to wait and you will get it soon or later. In general , if you are connected to internet, you will see a message that Windows 10 Creator Update is ready for download and install. So Windows is kind enough that will tell you when it is ready. This is the best way to get Windows 10 Creator Update and it is better to wait.
If you are in hurry and you couldn't wait , you may get Windows 10 Creator Update from: