Sorry to read that you are having compatibility issues. X-Aviation did try and make it very clear, by way of images, that this add on is only available for X-Plane 10 and is only 64 bit. The reason it is 64 bit only is because there were a number of files that needed replacing within Gizmo, and also going by user feedback when we were on the cusp of going 64 bit, the vast majority of our customers were asking "When is the DC-3 going to be 64 bit?" The only thing I suggest, from LES's end, is to contact X-Aviation directly and ask what your options are, as they are the ones publishing it. Apart from that, there really is nothing we, as developers, can do.