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  • sarcasimo
    +1

    I did an in-place upgrade from 8.1 to the Win10 technical preview with no issues. It basically installed Windows 10 like a Service Pack. (Via Windows Update)

    As for the cost, for the first year you can upgrade from 7/8 to 10 for free.

    Also, no more need for classic shell in Win10, the start menu is back and not terrible.