"AtomX cannot parse this file." Fix: You downloaded a pack built for AtomX 1.0. Open the manifest.xml and change the minVersion to 2.5 . If it doesn't work, the pack is too old.

High-quality CRT effects, film grains, and lens flares are now more optimized, providing a cinematic look without slowing down your render times. How to Correctly Download and Install AtomX Updates

You might ask, "Can't I just download any old AtomX pack from a forum?" The short answer: No. Here is why the quality of your download source dictates your success.