Welcome to the Cookbook

Here's a suggestion on how to take a 1.1 app and make it 1.2 ready:

1. Rename the root directory to something else (e.g. cakeRoot -> cakeRoot~)
2. Extract 1.2 to where you want your app to be (e.g. into the cakeRoot folder)
3. Copy all the models, views, and controllers from cakeRoot~ to cakeRoot
4. Manually apply changes to the config folder.
5. Browse around with debug enabled - read and address any deprectated/debug messages you see.

You may be surprised to see how simple it is.