Here's a tutorial on how to find the Directory folder for the DLL's:
1. Right click the S4 League you normally click (eg. on the Desktop)
2. Click properties
3. Look at the 'Target' and find that location (eg. "C:\Program Files\alaplaya\S4League\patcher_s4.exe")
4. Move the DLL's to this location
5. Start S4!
Please give me a Thanks if I helped