Since version 12, all compatible formats are now supported in the free HitFilm Express license. Therefore, there is no longer a Premium Formats pack available for HitFilm Express
The AVCHD/Dolby AC3 and MPEG-2 formats previously required licensing fees, which meant we couldn’t include them for free in HitFilm Express. This pack is no longer required, as long as your free software is up to date. Starting with version 12, these formats can be imported directly into the free software and are fully supported.
Make sure you have the latest version of HitFIlm Express installed for compatibility with the widest range of media formats: http://fxhome.com/hitfilm-express