Here is a way to manually inject in case your dll does not work.
1. Download Injec-Tor
Mirror 1] (Click to download)
Mirror 2 (Click to download)
This may be detected as a virus. It is not..
After you run InjecTOR; Find 'Load Dll' and then find [x]Freestyle.dll (Click to download) in your FGunz folder. Hit okay to load it.
Run gunz. Alt tab out.
Hit 'Window' on the right side on Injec-Tor. Find 'The Duel' in the list. Hit Inject Dll.