How to download the Aether for Minecraft?

For weeks i've been trying to download it half the time i do get it but it never finsihes downloading then i tried another download i got all the mods and things exported.But, It still does not want to work and i don't see any selection for the Aether anywhere. How come they don't make it easy to just download and what's stopping them from adding it to the original file of Minecraft? They got the Neather so how come they never add the Aether?

Unfortunetly the Aether Mod is not compatible with the current Minecraft Version. It is Outdated.

I have spent HOURS trying to do just that! And guess what?! I got it to work! **then I stupidly deleted it, but that's aside the point…
What I did was download about three different Aether mods into a single minecraft, and somehow, they worked! Each one had something the other needed, and I was able to get it to launch! I don't understand the details, but try downloading a few (carefully!) and see if it works. Other than hoping, I have no clue how to get it to work.
I have no clue why they didn't add the Aether… They really should!