The latest version of Nautilus can be downloaded from Softpedia
The GNOME developers behind the Nautilus project (now known as Files) have announced that version 3.9.3 is now available for download.Nautilus may have changed its name to Files, but it will take a long time for users to get used to it. In any case, Files 3.9.3 is finally here and it comes with a few modifications.
Highlights of Files (Nautilus) 3.9.3:
• A port to GtkPlacesSidebar has been implemented;
• Files will now check for the available mail clients before enabling the “sendto” extension;
• The location bar is now shown when entering "~";
• A menu item has been added to open the parent folder of search/recent items.
A complete list of changes can be found in the official changelog.
Download Files 3.9.3 (formerly known as Nautilus) sources right now from Softpedia. Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.