Where can I use Font Awesome Pro?
If you’re covered by a Pro license, you can use it in tons of ways — web sites & apps, desktop design software, Powerpoint & Keynote, embedded in your mobile apps, and lots more.
Pro is commercial software, so there are some restrictions. Biggest one is that you cannot distribute Pro to folks not specifically covered by the license (e.g. you can’t provide the files in your open source public repo).
More specifics about what is allowed are in the full Pro license.