Sorry I've just been busy with other stuff, but I just tried the game to see why you didn't do night 7.... As it turns out the game is glitched and you literally can't get to night 7 without the save code. Sorry for the confusion and struggle! This game is old and I don't play it so I just assumed night 7 worked, which is entirely my fault. You'll have to enter the night 7 save code to get there. I don't have the game's files on my PC anymore so I can't update the glitch.
I'll just leave the night 7 save code here:
2538487
