Thank you chrisofsweden for this instruction. It worked like a charm to convert my DCS World to the Open Beta so that I can fly the new A-10C II. When the new patch for the stable version is issued, I have confidence that I can revert to it using "DCS_updater.exe update @release"
Your information has been most helpful and is greatly appreciated. (I just wish that this information was printed with the A-10C II in the DCS store. It would have saved a lot of headaches.)