The Verizon upgrade assistant is built into the LG G3 from my POV. Very strange that some sites think [and link you to god know where and what] to download it for the G3. And the Verizon support page misleads the same way saying there is a CD for it -- but the CD wound up being a virtual CD from the phone, (see below,) haha. I had the driver installed, but it would not autoplay the 'CD' as my Win 7 system quickly was switching from 'installer' to 'media'. I noted my system still had my Samsung SII as a playable autoplay device and removed that unused phone (just in case) via regedit. Then, I kept the phone attached via USB, rebooted the PC since I still was not getting anywhere and finally noted the CD in my Explorer right after the reboot, clicked it and went merrily to install. Just finished the install now, and went from stock VS98512B to VS98523C.