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

https://staircaselab.com/product/single-signature/

File include : 

1. Single Signature.otf
2. Single Signature.ttf
3. Single Signature.woff
4. Single Signature Ordinary.otf
5. Single Signature Ordinaryc.ttf
6. Single Signature Ordinary.woff
7. Single Signature Thin.otf
8. Single Signature Thin.ttf
9. Single Signature Thin.woff
10. Single Signature Thin Ordinary.otf
11. Single Signature Thin Ordinary.ttf
12. Single Signature Thin Ordinary.woff
13. Single Signature Thin Tilted.otf
14. Single Signature Thin Tilted.ttf
15. Single Signature Thin Tilted.woff
16. Single Signature Tilted.otf
17. Single Signature Tilted.ttf
18. Single Signature Tilted.woff