IPv6Override is a standalone Windows GUI tool for Windows desktops and servers to allow IT Administrators to change IPv6 settings. 
It is common for IT administrators to want to disable IPv6. This is often because of some unknown, networking-related issue, such as a name resolution issue. Windows Vista and Windows Server 2008 and newer versions, by default, favors IPv6 global unicast addresses over IPv4 addresses. Microsoft does not recommend that you disable IPv6 or its components. If you do, some Windows components may not function. This is especially notable where Microsoft Exchange Server is installed and the services fail to start because the DNS of the DC cannot be resolved due to IPv6 DNS being the preferred resolver. By setting “Prefer IPv4 over IPv6” in prefix policies instead of disabling IPV6, services such as Exchange can run correctly, whilst other components that rely on IPv6 can also run unaffected.
This utility was written for the purpose of allowing IT Administrators to quickly modify various IPv6 settings to assist in troubleshooting and resolving issues relating to IPv6 and DNS resolution.
This application has been tested on the following platforms:
Windows 7 and above
Windows 2008 and above

This utility is FREEWARE and was written by Warren Simondson of Ctrl-Alt-Del IT Consultancy, Australia. www.ctrl-alt-del.com.au

The freeware version is offered AS IS. Ctrl-Alt-Del IT Consultancy has made every effort possible to ensure that IPv6Override is free of any bugs or errors, however in no way is IPv6Override to be considered error or bug free. You assume all responsibility for any damages or lost data that may result from any errors or bugs in IPv6Override.
IN NO EVENT WILL CTRL-ALT-DEL IT CONSULTANCY BE LIABLE TO YOU FOR ANY GENERAL,SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL OR OTHER DAMAGES ARISING OUT OF THIS PRODUCT.