I didn’t write this add-on, but I converted it to run in Blender 2.81. It appears to work fine with both Cycles and EEVEE. It should also work in Blender 2.80, though I didn’t try it there.
Enjoy!
ghost_frames.py (10.5 KB)
EDIT: Here is a slightly more cleaned up version. The previous link causes some harmless warning messages to show when you launch Blender; I’ve addressed those warning messages in this version so they no longer appear:
ghost_frames.py (10.5 KB)