What Build are you looking for? Why not just get get Odin, Root it, flash a Recovery, then install whatever you'd like?
I have Odin installed, don't really want to root. I would like the September Build (Verizon) Galaxy s6
G920VVRS4DQI1 this was when I was having great battery life! and trust me I searched on Google for over an hour. I found 1 site that has ALL the Updates but it wants you to wait 10 hours for the Download or pay $6 for 1 week which is an utter ripoff.
Reason being for wanting to Flash a different build is because Several Updates from this year (2018) are causing extreme battery drain. Around September I was getting little over 6 hours OST where as with the several last couple of updates this year Its being constantly dropping for the worse. I was barely getting 3 Hours OST.
SamMobile is the only Legit site I found that has these Firmware Updates but they also don't have the one I want. I did get the November Update from them and flashed it 3 days ago and already by OST has gone up to close to about 4.5 hours which is great improvement but I know my phone can do 6 OST with the right Build/Update.
The extreme battery drain issue with the recent 2018 updates is a common issue. A lot of people said Samsung did it so people would buy the New Galaxy phones on purpose. Who knows.
This is the site that has them all but wants you to wait 10 hours for the Free Download or pay $6 for a week.
https://samsung-firmware.org/model/SM-G920V/region/VZW/
Sammobile is quicker only 3 hours for the File to download but they only have One update for Android 7.0 (November one) the rest are 6.0
I got the November one from here and its doing great, lots better. Would Love September can't find it.
https://www.sammobile.com/firmwares/galaxy-s6/SM-G920V/
Thanks.