I want to download the Kyle mixer brush
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As long as you are using Photoshop CC, with a current subscription, then you can click at the top right of the brushes panel and from the drop down menu choose "Get More Brushes..." That will take you to the site to download Kyle's brush packs
If you cannot find the brush you want why not make it?
Each brush has a shape which you can base on an existing brush or define from scratch. An associated tool can also be saved with the brush shape. In your case That tool would be the mixer brush tool which has plenty of options in the options bar. Once you have the brush shape and mixer brush tool settings the way you want them save it as a new brush.