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You can install your LUTs into a specific folder in your user library and Lumetri will scan them in. If you are using several custom LUTs and want them to show up in the Lumetri dropdown menus we have a solution which was introduced earlier this year (2018 - version 12.1). I know this is inconvenient, but it really is the safest way to make certain your project will render as intended. You will then need to remove all LUTs from your project and reapply them.
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You should then install your custom LUTs according to the directions below. The safest way to proceed at this point is to completely reinstall PPro and AME so the LUT directories are restored to their default state as intended by our engineers. I know there are a lot of very official looking tutorials out there that tell you to do this, but that information is wrong.
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The problems you are experiencing are caused by tampering with the LUTs within the application package - please do not do this - it's not a recommended or supported workflow.
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