Hello there,
Yes, there should be a loadUI-cmd.bat file in your LoadUI installation folder, i can verify that it is put there during installation.
If you are missing it then you should either try to reinstall LoadUI and check the folder again.
If you don't want to do reinstall then you can always download it from Github using the links below.
There are two types, either using your systems JRE to start it or using the bundled JRE.
With system JREWith bundled JREJust put them in your LoadUI folder and run them from commandline or from double-clicking in explorer.
Hope it works out!