They released the directors cut version of the last episode.
Also as to the earlier, Age 1 was terrible both ratings and sales wise right off the bat. It never picked up. It was so poorly received that sponsors were dropping left and right, the network lost a large amount of money hence the embargo on anything AGE appearing on TV, and even for the G gen 3ds game they got rid of AGE off the cover asap it was so bad.
Age 2 was a bit better, but it was too late to save the show. Fans had already abandoned it. And while AGE2 helped , AGE 3 caused it to Tank again. Kio was just such a terrible character that he dragged almost all of age 3 causing the ratings to tank again.
He was a cheap attempt to make their own Kira/Setsuna. But where as Kira and Setsuna actually fought and did stuff, Kio was, stayed, and remained a little whiny hitch for the entire thing. Every other character was fine, but he just too disliked.
Also AGE was disliked for other issues. Pacing, lack of consistency, character designs, and stero types.
One of Ages worst issues was that if you were a female character, you literally only existed as a sacrifice to die for forced drama, or you were treated as a cum dumpster for the sake breeding the next strong MALE Asuno to be the main. What's that? Flit had a daughter? Eh well make her a nurse and show her every 5 episodes.