Installed new dual friction center force clutch clutch pedal is now very soft and doesn’t come back

I would start at the rod. Disconnect it from the fork. Push the fork twords the rear of the car. The throwout bearing should contact the fingers at this point. Pull it back about 1/8- 3/16”. Jam a roll of tape under the pedal or use a spring to hold it up. At this point, with the pedal up and the clutch fork resting just back from the fingers, adjust the nut on the rod to this position. You should be back in business. It may sound funny, but I had one that the rod was stripped. It would work the first few times and then the rod would push through the nuts causing the pedal to stick to the floor and the clutch to not engage.