Since Mac upgraded to an M1 chip and with the new MacOS, good old Unmult 1.1 doesn’t work anymore. You can use Unmult from Red Giant, but it comes with cost. This is a handy plugin that has many uses, 3d compositing, substitute the add mode when the broadcast system cannot support it, creating custom matte, for example. I don’t want to keep paying Red Giant just to use this plugin, so I created this RonnUnMult and I meant to share this with others for free. So, please enjoy. RonnUnMult for Mac and PC