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Amateur Member
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買筆記電腦時裝的是 Windows 7 Home Premium 64 bit, 花439元購得 Windows 8 Professional. 如果可以降級到 Windows 7 Professional, 等於是以439元從 Windows 7 Home Premium昇級為 Professional.
請問有人知道如何昇級再降級嗎?
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