Answer
This is a limitation of updating Windows 10 TH1 to TH2 as Microsoft description below.
https://www.microsoft.com/en-us/windows/windows-10-specifications
According to the System requirements from Microsoft, the free space in hard disk (C drive) should be 16GB for 32-bit OS / 20GB for 64-bit OS. Microsoft suggested that customers update OS via external device to Windows 10 TH2 and follow the instruction to get rid of this symptom.
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