If you have Affinity Photo, these are the instructions that should get you setup. It is working for me.
In Affinity Photo, go to Edit... Preferences... Photoshop Plugins and choose "Add." Point it to C:\Program Files\Skylum\Luminar Flex. Affinity Photo will prompt a restart. After the restart, load a photo and choose Filters... Plugins and you will have access to Luminar Flex. The actual plugin file is LuminarFlex.8bf.
Update (6/5/19): With the release of Affinity Photo 1.7, the Flex plugin no longer works.
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