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Download Opera browser with:
onto Build 2245.
this system Win 10 Pro x64 is now running Build 2245.
unfortunately my IPv4 address remains reported by http://www.dslreports.com/whatismyip when using Opera developer 39.0.2245.0 Private Window with VPN active:
My web IP address is: 216.144.. *** GOOD! this is Opera Private Window using USA VPN ***
Request Headers do not reveal another IP
Encrypted websocket reveals your IPv4 address is xx.xx.xx.xx *** BAD! THIS IS MY IP ***
good to know, about how to stop auto-update! thanks rstacey
I may revert to a previous build to regain VPN functionality... so long as I did not permanently delete the *.deb file for a recent build on that system! the single system I have where VPN is not functioning, it is a clean install of Opera developer 2234 build on Ubuntu 12.04 64-bit, it is real hardware instALL not a VM! Private window VPN doesn't work whether the WebRTC Leak Prevent v1.0.7C extension is Installed and/or Turned On, or not...
Version information
Version: 39.0.2234.0 - Opera is up to date Update stream: developer System: Ubuntu precise (12.04.5 LTS) (x86_64; XFCE) Browser identification
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2716.0 Safari/537.36 OPR/39.0.2234.0 (Edition developer)
digitaman, thanks? for pointing that out
as for why IP is reported, I don't know why...
my IPv4 address leaks as well at http://www.dslreports.com/whatismyip when using Opera developer 39.0.2234.0 Private Window with VPN active, on Windows 7 32-bit system 
FYI https://diafygi.github.io/webrtc-ips/ only tests for an IPv6 address, when I am in Opera Private Window with VPN active this website does not display an IPv6 address
still experiencing the same problem here... when in a Private Window, with VPN On, it doesn't matter if Canada, Germany, Netherlands or USA location is chosen for the VPN, I cannot load any webpages in the outside world, the following prompt appears:
This site can’t be reached
The webpage at http://www. $ .com/ might be temporarily down or it may have moved permanently to a new web address.
The browser was recently updated to build 2234:
Version information
Version: 39.0.2234.0 - Opera is up to date
Update stream: developer
System: Ubuntu precise (12.04.5 LTS) (x86_64; XFCE)
Browser identification
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2716.0 Safari/537.36 OPR/39.0.2234.0 (Edition developer)
ojebuss,
check out solution already posted by dadsyouruncle
Here is How To Disable WebRTC in Opera to Prevent Leaking Your IP while using the built in VPN
yourdadsuncle's solution - enabling the "WebRTC Leak Prevent" extension - works for me (using Opera 38.0.2205.0 developer on Windows 10 64-bit)
both Local & Public IP are no longer displayed
thanks 
whoa, not so fast... as other users of have noted, Opera developer v38.0.2205.0 browser VPN functionality in combination with VPN service provider 'privatizes' your Local IP properly, but your Public IP remains very public!
confirm your Local IP and Public IP by loading test page at https://diafygi.github.io/webrtc-ips/
I installed Opera developer v38.0.2205.0 on Windows 10 64-bit a few days ago, and also noted the VPN symbol is not displayed left of the URL after a page load is complete, when the browser is used in Private Mode.
But it appears the VPN feature works in Private Mode, even though the symbol does not appear. As long as VPN functionality is toggled ON in Menu / Settings / Privacy & Security / VPN / Enable VPN, VPN functionality appears to work just fine when browsing to a web page that displays your VPN such as www whatisipaddress dot com , etc.