I installed these softwares successfully:
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python 2.7.13
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SEGGER J-Link V5.12g
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nRF5x-Command-Line-Tools_9_0_0_Installer
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the PPK software package
My PC platform is 64-bit Microsoft Windows.
I just could not open the PPK desktop application by click ppk.py shortcut, but it showed up and disappeared right away.
The PPK board is connected by a USB cable, while the nRF5x Development Kit is just connected by a J-Link cable and a USB cable.