Without a valid subscription and dongle, even if you download the software, it will run in "demo mode" with severely limited functionality (view-only, no flashing or clearing codes).
Assuming you have your license, dongle, and official installer, follow these steps: john deere service advisor software 5.3 download
: Supports system calibrations for engines, transmissions, and hydraulics, as well as controller reprogramming. Without a valid subscription and dongle, even if