Yes, there is, but it’s a bit complicated:
– Install HitFilm Ultimate (2) and activate it (you can use the demo version which is still available).
– Rename program folder (e.g. “HF2U”)
– Copy program folder “HF Pro 4” and rename the copy to “HitFilm 2 Ultimate”
– From the program folder “HF2U” copy (overwrite) the file “HitFilmFileIOPlugin.dll” to the program folder “HitFilm 2 Ultimate”.
– In program folder “HitFilm 2 Ultimate” (which should be the copy of “HF Pro 4”) rename the .exe file to “HitFilmUltimate.exe”.
– Be sure in the Vegas Pro program folder the file “HitFilm 2 Ultimate.fio2007-config” exists and it contains the correct path (to “HitFilm 2 Ultimate”).
Once these modifications are done the workflow of using HitFilm Pro 4 from within Vegas Pro 13 should work the usual way (at least it does for me).