How To Install Logic Step Sequencer Patterns:

Navigate to the Step Sequencer Settings Folder. This is typically under the patch of: Users > username > Music > Audio Music Apps > Step Sequencer Settings.

Apple Finder showing the Step Sequencer Folder

Find the Patterns folder and drag and drop the patterns in there. Organize how you see fit.

Logic Finder showing the Patterns folder with the Hip Hop Drum Patterns as a sub folder with the step sequencer patterns files shown.

Open up Logic and create a pattern region.

Apple Logic Pro splash screen with Select Pattern Instrument highlighted.

Open up the Pattern Browser and select "User".

You'll see the drum Patterns in the Pattern Browser

HipHop Drum Patterns in Logic's Step Sequencer with all the individual files shown.