Introduction
There are pros and cons in the psk file for export the blender to unreal.
To get the blender export for psk. It in the download section of this website. The current update is stable and working.
Pros
The Export works. There no error yet.
Cons
There are two method to add the bone but it does work other ones doesn't work.
Old Version
Opti_PSK_Dump.py (www.p-fat.net) -This is from the script that I use. Use what you like for this script. Just read me detail in this part. Use at your own risk
Links:
http://www.p-fat.net/
PSA
Other