Be aware of requirements
Since 19.07.2011 the requirements is raised to:
* PHP - 5.3
* TYPO3 - 4.6
* extbase - 1.4
* fluid - 1.4
- PHP - 5.3 for use of hook service
- TYPO3 - 4.6 for use new translation handling in wizard icon registration
- extbase - 1.4 for use of DI in action parameters
- fluid - 1.4 because the templates use the new viewhelpers of fluid
The most important change is PHP raised requirement to 5.3 because the hook service uses get_called_class. This is needed as base for defining different hooks by classes.
The next important think is TYPO3 raised to 4.6. This was necessary to use new methods to prevent too many deprecation warnings.
Beside this extbase 1.4 brings DI in action parameters, which is needed to able to extend the user model with own fields. Without this the model is mearly useless in custom enviroments.