SilverStripe 3.4.3 and 3.5.1 have been released.
These releases contain mostly bugfixes including some important fixes to HTML Editor.
To get setup, you can install this using composer (as below):
composer create-project silverstripe/installer ./ss35 3.5.1
You can also download pre-built zip / tar from http://www.silverstripe.org/download.
Damian Mooyman | Senior Platform Developer