Wiikey Gamecube SD Help

I just got a Wiikey brand Gamecube/Wii SD adapter in the mail, and tried to set it up via the SDLOAD tutorial, but when I try to enter the code, action replay says "Data is Invalid". The code is still added, but I can't activate it. I'm really frustrated right now, as I just spent about an hour typing the damn thing in. Is there any other way to get this working? I couldn't find any good tutorials on it.

Also, I can't find a download of SD Patch anywhere. Where can I download it?