Updated with latest instructions

Readme.md

@@ -12,7 +12,13 @@ CSSketch is completely open source, so feel free to contribute to its developmen
 ![Screencast](https://raw.githubusercontent.com/JohnCoates/CSSketch/master/screencast.gif)
 
 ## Download & Install
-### Download **CSSKetch_Install.zip** from the [latest release.](https://github.com/JohnCoates/CSSketch/releases/latest)
+#### CSSketch is available through [Sketch Toolbox](http://sketchtoolbox.com/). This is the best option for installation, as it automatically keeps CSSketch up to date.
+
+## Download & Install Manually
+Download from [Github](https://github.com/JohnCoates/CSSketch/archive/master.zip)
+
+Open CSSketch.sketchplugin and Sketch will ask if you'd like it installed
+
 
 ## Using CSSketch