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UPDATE: Official Android 6.0.1 Marshmallow is now available for Note 4. For more info on the ROM, visit source from below.
All you need to do is install the bootloader from OK1 firmware and it’s optional to flash OK1 baseband. There is also a workaround to downgrade your system to Android 5.1.1 Lollipop on your Note 4. Don’t worry, TWRP will remain intact and won’t be replaced by stock recovery. To install it you will need to install an engineering bootloader and the Baseband from PB5 firmware before you make it work via TWRP recovery. So if you are looking forward to flashing it, then you better backup. So remember, this will only work with devices running Snapdragon processor and not with the Exynos ones and is meant for the N910P variant. It is based on the official Samsung TouchWiz firmware and has been reported running with no major bugs or instability issue. Don’t know how true that is, but if you want to believe in an actual Galaxy Note 4 running the latest TouchWiz firmware, then here is a port that will take your device to Marshmallow. Some time ago, some Note 4 reported having received the Android 6.0 Marshmallow update from Samsung, like in this video here and some of the Sprint devices as well.