I don't see that cmd file & flash box.
As soon as I 2x click the Jar file the configurator opens and I can access the three parameter boxes to alter things, I press compile and flash and the test settings I input are saved to the .ini files and show in the side pane on the rhs.
When one comes out of jar and opens the file .ini, the new test files are there next to the latest commit of the github. I simply delete the unwanted test .ini files so looks like all is ready to go.
Look for the stvp folder, and make sure the path is correct in the bat file, because that's not the result (ie command box messages) that myself and Bikes4Two got. As far as I'm aware, when it compiles, it tells you in the command box as it compiles, and also notifies of errors. Therefore nothing may happen when you connect it to the controller.
#8 differed slightly and I left it, it read "PATH = %PATH%; C:STMicroelectronics\st_toolset\stvp; etc,etc.
If the path to the stvp directory looks like the screenshot below, on your old laptop, that line needs to have this bit deleted:
\st_toolset
My configurator compiles and attempts to flash whether or not I'm connected to the internet, it's best to disconnect now to prevent Windows 10 being too clever for your own good.