Windows
Step 1: Press Win + R to open the Run dialog.
Step 2: Paste the following path:
%AppData%\Blackmagic Design\DaVinci Resolve\Support\Fusion\Fuses
Step 3: Press Enter and paste your downloaded Fuse files in this folder.
Mac
Step 1: Open Finder.
Step 2: Press Cmd + Shift + G.
Step 3: Paste this path:
~/Library/Application Support/Blackmagic Design/DaVinci Resolve/Fusion/Fuses
Step 4: Press Enter/Go and place your Fuse files here.
Linux
Step 1: Open your File Manager.
Step 2: Press Ctrl + L to type a path directly.
Step 3: Paste the path:
~/.local/share/DaVinciResolve/Fusion/Fuses
Step 4: Hit Enter and place your Fuse files here.