Hi Wolfgang,
Until very recently I had both FP7 & FP8 working with Affinity Photo 2.6.5 (Win). If I now try to open FP7 or FP8, the application fails to launch, and a crash report is generated.
Both FP7 and FP8 are however still working with Affinity 3.
The following link will take you to a relevant post.
https://forum.dxo.com/t/filmpack-8-in-affinity/55630
DxO’s view is the FilmPack plugins are not currently supported.
I have tried reinstalling Affinity Photo, and also the FilmPack plugins, but still cannot get them to work in Affinity Photo 2.6.5 (Win).