Duolingo LA from EN versions:

Trees:
v0: 2019-01-25  ? (Beta)
v0: 2019-08-28  ? (Beta)
v1: 2020-03-14, 22 Skills (22 Different lessons)

Paths:
1.0: 2022-09-10, 22 Skills (22 Different lessons) (14 Units)
1.1: 2023-09-10, 22 Skills (22 Different lessons) (14 Units)
1.2: 2024-05-01, 22 Skills (22 Different Lessons) (25 units)

https://liuch.github.io/duolingo_courses_overview/
https://duolingo.fandom.com/wiki/Course_list
https://duolingodata.com/
https://duolingodata.com/oldtable.html
https://ardslot.com/duolingocrowns.html

Edited by Mat!/Ozone, 2024-05-02.