pj64 v1.6 detects every controller input except c-down. i know its not the controller since i used 2.3 and it worked perfectly fine and i even calibrated it and the computer detected c-down. can someone help or is there another version of project 64 that speedrun.com accepts.

What adapter and controller are you using?

i use the original n64 controller and i use a Mayflash N64 Controller Adapter

Weird, my Mayflash adapter works fine. Do you have the PS2/N64/SS one or the only N64 one?

Congratulations...?

only an n64 controller

Try changing the controller plugin by going to Options > Settings > Plugins > Input plugin > then select Jabo's DirectInput7 1.6. I had the same problem and it worked for me. Let me know if it helped