For everyone who has run the .bat file but receives an blank/empty space after the Setting the search path in the following file was successful:, I have posted a manual workaround for you:
As I say in the post there, our primary recommendation for this case is to just purchase an executable installer by emailing info@ladybug.tools. But, if you’re just doing the install on one machine have some time to spend, the manual workaround will get you there. And will save you from the current workaround @spyros is doing by adding a custom GHPython component to each Grasshopper definition.