Using Icons with Apps and Software
Using Icons as SVG
SVG is a widely used vector format that supports almost all desktop design apps such as - Illustrator, Photoshop, Figma, and so on. All you need to open individual SVG file on your desired software and use it depending on needs, there is no specific plugins or extra configurations required.
Using TTF Fonts with Desktop Apps
If you would like to use icon fonts with desktop software such as - photoshop or MS word. You need to install TTF font and choose LineIcon as font while using it under the software. You can find all the references of icons if you open the demo.html file from the download package.