Thank you. so sorry the tool is not maintained anymore, it was the best I ever saw for this task
I know it’s a solid tool, but I’ve been developing it since 2007 - that’s nearly 20 years! :-D
If it could help, there’s also MageBook, which was developed by the Italian gamebook community; it’s a tool derived from LibroGameCreator and can import its files. It doesn’t have every single feature, but it might just be what you’re looking for.