Assassin's Creed: Revelation DLC (The Lost Archive)

I am going back to my old games and filling the gaps of missing DLCs but as of today AC:Revelation's The Lost Archives DLC is no longer available on Uplay nor anywhere outside of it.
The only way I have found out is to get the AC:Revelations - Ottoman Edition which includes this DLCs.
Therefore my question is: Would buying the Ottoman Edition and then using its activation key in Uplay "upgrade" my standard AC:Revelations version to Ottoman Edition? Hence giving me access to The Lost Archives? If not, is there any other way to get this DLC today?
Thanks a lot for any response, this is very vital to me
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How do I get The Lost Archive DLC?
1) Right-click on ACR in Steam, select 'View CD Key'. 3) On the main menu for the game, go to Extras -> Additional Content (I think) -> Enter Key. Type in the key for the DLC. 4) If it works, The Lost Archive should show up on the main menu underneath the Story mode.How long is The Lost Archive AC Revelations?
Clocking in at around two hours (or more, depending on how often you fail or how slavishly you hunt down its Achievements/Trophies), it's a collection of seven first-person puzzle levels, which you'll navigate by solving switch puzzles and creating platforms and ramps out of thin air.How many memories does The Lost Archive have?
The Lost Archives is made of seven memories (levels, stages, etc.) in the style of the "Desmond Sequences" of the main game (the first-person block puzzles).Does AC revelations have DLC?
Assassin's Creed: Revelations' Ottoman Edition, meanwhile, is as expected the "Game of the Year" edition of Revelations. It includes The Lost Archive as well as both multiplayer DLC packs already released.Au/Ra - Assassin (Lyrics)
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Images: Andrew Neel, Jens Johnsson, Engin Akyurt, Kindel Media