This mod was originally made be Wolfishy, all I did was convert it to Skyrim Special Edition

Permission from Wolfishy's original mod's Readme file - http://www.nexusmods.com/skyrim/mods/49046/?
Licensing/Legal
===============
You can do whatever you want with this mod but all I ask in return is that
you give me credit if you distribute any part of this mod. I would also like
to know what mods are including my work.

YOU MUST HAVE DAWNGUARD DLC FOR THIS MOD TO WORK

Descrption

I really liked the Lost to the Ages quest and having Katria help me out in the few fights during that quest so I thought I'd be fun to have the
possibility of having her as a permanent follower in the actual game.

This mod adds a journal to the Aetherium Forge area written by Katria after
her and the Dragonborn part ways at the end of the Lost to the Ages
quest. Upon reading the diary, Katria is re-summoned to the forge room
as a recruitable, fully-voiced follower.
(Not Katria's original voice as that had no dialogue for follower commands but the new voice sounds very similar :) )

There are 3 versions that you can use for your game depending on how you want Katria to look

1) Katria as a Nord - needs main file AND black face fix file
2) Katria Redguard - use Redguard only stand alone file
3) Katria Ghost      - She comes back as a ghost still - use KatriaAlive Ghost Edition only stand alone file

UPDATE: Katria is alive (except Ghost version) and all 3 versions are marriageable

Dawnguard is needed as she is based on Katria's in-game model

So far I can confirm Katria works with AFT and UFO

IMCOMPATIBILITIES