Its a bit of a pain, but its doable.
Download the zip file (
https://github.com/deftjs/DeftJS5/archive/develop.zip) and copy the DeftJS5-develop directory beside any Ext directory (Mine is in c:\program files\sencha)
So I have:
C:\Program Files\Sencha\Ext
C:\Program Files\Sencha\DeftJS5-develop
Install Nodejs (
http://nodejs.org/#download) (you can skip this part and install all of the "npm" stuff manually if you want. just make sure everything is in your PATH).
Install Ant (npm install -g ant)
Install jsduck(
https://github.com/senchalabs/jsduck/releases). Make sure its in your PATH.
Install CoffeeScript( npm install
-g coffee
-script)
Open a terminal and go to the DeftJS5-develop directory you created earlier.
go to the packages/deft directory under that.
type 'ant build'.
You'll find the new files under the 'build' directory.
Hope this helps. I wish they'd put this stuff on their git site.