What is going on with Luban?

Luban somehow got deleted off my laptop and now I have tried to install it again. I laser engrave using camera capture. When I load a picture onto my workpiece I no longer get activated to load G-code and then load it onto the program. Instead I get a circle with a slash going through it.
Please tell me what version of Luban I should have on my MacBook Pro and what drivers I need to install. I am stuck and I need to get this. fixed as soon as possible.