Can you explain why the Condesce died? I dont know if i misread that but doesn't LEs 'curse' make the afflicted person immortal?

It’s supposed to give Inconditional Mortality until the person inflicted by the Curse is sort of ‘allowed’ to die for Lord English. The fact Condy died can mean a variety of things!

1) He didn’t need her anymore, all he needed her for had been done, and thus she was simply useless and in fact, quite a liability given she was plotting against him.

2) The fact she was trying to take him down nullified the Curse as he’d not want her power to be used against him.

3) The Timeline we’re in at the End is not the Alpha Timeline.

For now, we can just speculate though.