To uninstall the Windows technical Preview from an upgrade to a stable Windows operating system, find KB2990214 and uninstall it. See The Windows Club blog article, How to Uninstall Windows 10 Technical Preview.
Thanks for the heads up. However, IMHO it is a bad idea to upgrade Windows 10 TP from a stable Windows Version. We could easily install Windows 10 as a Virtual Machine to play with.
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