If you want to migrate from any release equal to or later than qooxdoo 1.0, you can migrate directly to the target version, say qooxdoo 1.4.2.
Any release equal or prior to qooxdoo 0.8.3 is considered as a qooxdoo legacy release. If you are migrating from any release prior to qooxdoo 0.8.3 to a newer version, say qooxdoo 1.4.2, then firstly you should migrate to the version qooxdoo 0.8.3 and then migrate to the target version, that is, qooxdoo 1.4.2. You can download this version from http://sourceforge.net/projects/qooxdoo/files/qooxdoo-current/1.4.2/.
1. The qooxdoo migration tool updates the source files and cleans/deletes certain directories. To be on the safe side, let us make a backup of the whole application before migrating to the newer version.
2. Let us update the configuration files to refer to the new version of qooxdoo SDK. In the Team Twitter application, we are referring to qooxdoo 1.2 SDK. The qooxdoo team has released a few releases by now. Let...