No idea where that PP comes from, never heard of it, but “ATC” must not mean what it usually does, since it’s not possible to support an actual ATC on a Shapeoko.
Anyways, for VCarve Desktop you may be better off using @neilferreri’s very cool post, available here. It does support the BitSetter / multi-tool jobs.
To make my life easier, what I did is create a custom PP folder, and put it there. This way, this is the only one that shows up in that dropdown list.
(the procedure is: File => Open Application Data Folder, create a “My_PostP” folder there, and put your favorite PPs in there, restart VCarve)