Duolingo SV from EN versions:

Trees:
v0: 2014-05-30  ? (Beta)
v0: 2014-11-17, ?
v1: 2015-01-23, 66 Skills (66 Different Lessons)
v2-v3: ?
v4: 2022-07-23, 70 Skills (70 Different Lessons)
v5: 2022-08-30, 85 Skills (85 Different Lessons)

Paths:
1.0: 2022-09-10, 66 Skills (66 Different Lessons) (43 units)
2.0: 2023-03-10, 85 Skills (85 Different Lessons) (55 units)
2.1: 2023-09-10, 85 Skills (85 Different Lessons) (55 units)
2.2: 2023-12-02, 85 Skills (85 Different Lessons) (97 units)

tree_sv_en_v1_experiment
tree_sv_en_v2_experiment
tree_sv_en_v3_new
tree_sv_en_v4_existing
tree_sv_en_v5_launch_new

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.