
The Android 6.0.1 Marshmallow update N910TUVU2EPE3 for the Galaxy Note 4 on T-Mobile weighs in at 1.5GB, that's because it adds several new features to the handset aside from user interface improvements. The update does not appear to include the latest Android security patch. T-Mobile has just started rolling out this update so it's going to take some time before Marshmallow for Galaxy Note 4 owners on its network goes live for everybody.
Thanks, Ankit!