It says the .dll is still missing even though I have it in the right folder as my old light filter .dll. Even if I try to load it from the plugins menu, it says it's not supported.
Make sure you download the latest Arnold. It wont work if you sit with a 6.1 version for example.
https://www.arnoldrenderer.com/arnold/download/
Yeah I already had it installed. It may be where I'm putting the .dll.
I have it in C:\Program Files\Autodesk\3ds Max 2020\ApplicationPlugins where I have my old .dll
I took my old .dll out and replaced it with the new when I had the latest arnold installed.
Put it in the hidden pr default. "ProgramData" folder, its not the one where max is, its where arnold is installed.