If I remember correctly the x-carve post processor for VCarve causes an error with the Photo Carve
It is the ARC variable as photo carve doesn’t use it.
If so you may want to try these
X-Carve photo carving
Also check the file menu and see if there is a
“Open Application Data Folder…” option
If so that will also get you to the location of where the post processor folder is located (just in case it is duplicated in a different location)