For owners of Oculus Rift it is really easy to get ATLASrift. Simply send me (firstname.lastname@example.org) the mail you used to register with Oculus and I will send you an invitation for the beta tester. In that way you will be always have the application auto-update.
To directly download the latest version from this directory: link. There are two version - one that is universal and works with all hardware (OR, HTC vive, no VR at all) and one OR specific. Simply unzip the file and start the executable.