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If you want to just get the Jar, go ahead and download it.
If you are using the Vaadin Plugin for Eclipse, first upgrade the plugin using the [tt]http://vaadin.com/eclipse/experimental[/tt] update site, and then upgrade the Vaadin version from the project preferences.
If using Maven, the repositories will replicate in a few hours.
As always, when upgrading from an earlier version, you should recompile any custom widget sets and refresh your project in Eclipse. See the General Upgrade Notes for more details on upgrading.