If you manage to download the update, here is what changes on your V5:
When the Vivo V5 was released, Vivo’s update policy for mid-range devices was conservative. While the successor, the Vivo V5 Plus, eventually received an official update to Android 7.0 Nougat (and later 7.1), the standard Vivo V5 was largely left behind on Android 6.0 Marshmallow. vivo v5 nougat 7.0 update download
This is the safest method as it automatically finds the version specifically for your hardware. Android 7.0 Nougat - Android Developers If you manage to download the update, here
The Nougat 7.0 update for Vivo V5 includes: the Vivo V5 Plus
