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

https://displaytypefont.com/product/gainstone/

File Font Version : 

1. Gainstone Italic.otf
2. Gainstone Italic.ttf
3. Gainstone Italic.woff
4. Gainstone Outline.otf
5. Gainstone Outline.ttf
6. Gainstone Outline.woff
7. Gainstone Regular.otf
8. Gainstone Regular.ttf
9. Gainstone Regular.woff