the third version is still unleaked but we got 3 snippets from it: the first snippet leaked in August 2016 (https://picosong.com/HEV3/), the second one in December 2016 and the last snippet in March 2017. I can’t find the other snippets. I think they were took down.
While she never published this song, because it is not registered anywhere and it was just a rumour before the snippets started leaking, I think it was done under “Lana Del Rey” pseudonym, but maybe I am wrong. I am only assuming this because “I Want It All” was later turned into “National Anthem”, which is by “Lana Del Rey”.