You have to have Python installed on your computer and then run zgc_tool.py.
When you run it you will get some errors and you will see some missing python libraries/packages.
You will have to install them as well.
Telink should have done it better and provide all necessary libraries
It is interesting that in the Zigbee SDK Developer Manual they say:
4) Auxiliary control software on PC (ZGC)
• Zigbee_gateway_controller.exe
So it tells you that you have to install module PySide6.
To install it you have to do: pip install PySide6
Then you will get another module missing and you would have to install them.
On other pictures you have it written in Chinese which I can't understand.