sdkmanager.exe crashes on first launch after extracting from .zip

Hello,

Trying to install Connect IQ SDK on a clean Windows 10 LTSB -

• Downloaded connectiq-sdk-manager-windows.zip
• Extracted contents to C:\Temp\connectiq-sdk-manager-windows
• Launched C:\Temp\connectiq-sdk-manager-windows\sdkmanager.exe

This shows an empty window with a "busy" mouse cursor -

After several seconds the following crash dialog pops up

Windows is up-to-date. There's literally nothing else on it, it's a fresh install.

In which direction do I have to dig?

Thanks