Download or create the DCTL file
Open DaVinci Resolve
Go to Preferences
Open Color Management or Lookup Tables settings
Locate the DCTL folder path
Copy the DCTL file into the correct DCTL folder
Restart DaVinci Resolve
Open the Color page
Add the DCTL from the OpenFX or LUT browser if supported
Apply the DCTL to the clip or node
Save the project