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Where do I put the Arnold Material Library of C4D?
I downloaded it from here: https://docs.arnoldrenderer.com/display/A5AFCUG/Material+Library
It should default to:
C:\Program Files\Maxon Cinema 4D R21\library\browser
Or you can also put it in your user folder:
C:\Users\...\AppData\Roaming\MAXON\Maxon Cinema 4D R21_64C2B3BD\library\browser
Paths will vary based your own setup
Note that the material library from the docs (https://docs.arnoldrenderer.com/display/A5AFCUG/Material+Library) is shipped with C4DtoA, you don't have to install it. What you can download from the docs is a scene file containing the materials.