Boxcutter question

Hi, Im from C4D, and we had a developer who made a pretty awesome plugin / scripts named Cactus Dan and he passed away, and his work was sadly interrupted. I was thinking about buying Boxcutter, but I want to know if the developer is one person or is a studio and what happens if for some reason he is unable to continue working on the plugin, does the free code in Blender applies to plugins? can anyone pick up where the developer left? is the code open ?