I'm not yet an Affinity user but I just updated my OS to High Sierra. Unfortunately High Sierra + Nik + Photoshop don't seem to like each other. Nik Software crashes Photoshop. There's a workaround if you only edit one photo at a time but no workaround if you batch edit using an action. Pretty much ALL my images are edited with Nik and it's impossible to do them one by one due to the bulk of images. I'm interested in knowing whether Affinity works ok with Nik Software and the High Sierra OS. Any help is greatly appreciated!! Thank you!