If you want the full version and license for commercial use,
you can purchase here :

https://fontkong.com/product/south-forest-font-duo/

File Font Version : 

1. South Forest.otf
2. South Forest.ttf
3. South Forest.woff
4. South Forest Italic.otf
5. South Forest Italic.ttf
6. South Forest Italic.woff
7. South Forest Duo.otf
8. South Forest Duo.ttf
9. South Forest Duo.woff
10. South Forest Duo Italic.otf
11. South Forest Duo Italic.ttf
12. South Forest Duo Italic.woff