The Lenovo K3 Note has the Marshmallow update for a quite long time, and now it is time for the Lenovo A7000. Besides Android 6.0, we will also receive the Android security patch from the last month.
The software weighs around 1.3 GB. It may take some time before your phone will receive one. You can start in manually from Setting menu of your device.
The 2 GB of free space is required to perform the installation of the update.