Here's how u can install it
Note:- This OTA.zip file is only for Moto G4 Plus (Indian-Athene-Retail)(XT1643, XT1640, XT1626 ,XT1644)
1) Download the ota file from this link
2) Place it in Ur internal storage
3) Charge your phone to atleast 60%
4) Boot into recovery
(Power off ->Volume up + Volume down
+ Power -> select recovery mode )
(If u see no command , press volume up + Power )
5) Once booted into recovery , select "Update from SD Card"
6) Select the downloaded Nougat Zip File
7) Wait for 10 Minutes
8) Select Reboot Once installation Completes
9) Enjoy Nougat
Your warranty will not be Voided .
Still am not responsible if anything happens to your phone .
Try at your own risk .
Thanks to Rahul Trivedi for capturing the zip file