These releases fix an issue in 3.4.4 and 3.5.2 regarding broken tree view in the CMS pages section.
To get setup, you can install this using composer (as below):
composer create-project silverstripe/installer ./ss35 3.5.3-rc1
You can also download pre-built zip / tar from https://www.silverstripe.org/download#download-releases.
Damian Mooyman | Senior Platform Developer