Why rainbow filter is not working?

https://preview.redd.it/pdvw8otafbmh1.png?width=2329&format=png&auto=webp&s=b1ac7c6be5ae91a0b422c76d0055a886a6bdfb59

You can see on the screenshot I attach I already put the filter on the correct path and I already relaunch the games several times but the filter is never working.

I follow the tutorial here:
https://forums.crateentertainment.com/t/tool-grim-raynbow-aka-rainbow-filter/42765
I download the filter from here:
https://grimraynbow.com/en/gd/filter?preset_id=1-1

What did I do wrong here? can anyone help me? thanks