Question: how to download presets to lightroom mac?
Answer: Open Lightroom.
Go to: Lightroom (Dialogue) • Preferences • Presets.
Click on the box titled: Show Lightroom Presets Folder.
Double click on Lightroom.
Double click on Develop Presets.
Copy the folder(s) of your presets into Develop Presets folder.
Restart Lightroom.