I recently purchased a Lightroom Presets pack that I intended to use with the Lightroom CC mobile app. When I downloaded the installation guide, all the steps were specific to installing the presets on a desktop computer (with the desktop version of the program). Does anyone know of a way to add the Presets onto to the mobile app? The files themselves are documents not DNG files and I can’t find a workaround.
You should contact the author.
Tried that, no response for a week 
Look at here METHOD 2 ( how to Sync Lightroom Presets from Lightroom CC to Lightroom Mobile (MAC & PC)
https://www.beart-presets.com/how-to-install-lightroom-mobile-dng-files
There are two ways to install presets in lightroom, either through laptop or mobile directly. you can select anyone. Installing using laptop is very easy process.