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Minor fixes to SDK update PowerShell Script (#8617)

* for Win 7, we need to import BitsTransfer before using it
* switch to PowerShell's build-in archive expander (instead of relying on .NET)
M
Michael Goderbauer committed
582df7b6435b8bfca8ab74e7aa422b29d0878041
Parent: 3d07941
Committed by GitHub <noreply@github.com> on 3/7/2017, 7:14:59 PM