Upgrade Ext JS 4.1 to Ext JS 4.2 with Sencha Cmd
When you started your Ext JS 4.* project with Sencha Cmd you know how easy it works to startup and scaffold.
It's also easy to upgrade your application to the latest Ext JS 4.2 build.
Download Ext JS 4.2
Unpack the folder, open your console and navigate to your Ext JS app.
Enter the following command to upgrade:
sencha app upgrade ../downloads/ext4.2
(the last path points to your unpacked folder of extjs4.2)
And that's it!