step 1: purchase SD Preset pack
step 2: follow the prompts to download the zip file of presets
step 3: once presets are downloaded, open Lightroom on your computer
step 4: once in Lightroom go to your top left screen corner (Mac) and click: file-> import develop profiles and presets -> go to your downloads -> select the SD Preset zip file or all presets within zip file and press import. This will seamlessly integrate your presets into Lightroom Classic.