I’ve just activated a new release (v12.1) of IfcDoc to github.
Please use carefully and post any problems or issues here to the forum or log an issue on github.
Maybe you have different security settings to me as I can download it with Chrome. If others experience a similar issue, please post here. The zip file does have the executable inside.
Great work! It seems that the conversion problems are really solved 
The issue solved, I download it.