Save the Greater Than Gatsby preset folder in an easy to find location on your computer.
Copy (Command + C on a Mac or CTRL + C on a PC) the entire preset collection folder (make sure you do not copy any PDFs or Brush folders).
Open Lightroom and select the following from the menu bar:
Mac – Lightroom > Preferences
PC – Edit > Preferences
When the Preferences box pops up, make sure you are on the Presets tab, and then click the Show Lightroom Presets Folder button. Note: ‘Store presets with this catalog’ should remain unchecked.
You will be taken to a folder named Lightroom. Click inside and find the Local Adjustment Presets folder.
Leave the current window open. Go back to the place where you saved your Greater Than Gatsby brush preset folder and select all the brush preset (.lrtemplate) files inside the folder. Note: To highlight all files: Click the first preset file, hold the Shift Key and Click the last preset.
Paste (Command + V on a Mac or CTRL + V on a PC) the .lrtemplate files into the Local Adjustment Presets folder.
You will need to restart Lightroom before your brush presets will appear in the brush palette.
To find your GTG brush presets, click the brush icon, and then you will find them under Effect: in your brush palette.