How can i make downloadable content?

I have a big text, but sometimes for people easier to download this file and read rather use application. I make this picture in Photoshop. So how can i make this logic? When i click “Download” button and .docx file is start to download on person’s device.
110253-без-имени-1.jpg

Try this: Unity - Scripting API: Application.OpenURL.
Also take care of having proper permissions (in manifest file for Android, for example) and prefix URL with “http://” (c# - Unity3d Application.OpenURL on a mobile device(both Android and iOS) - Stack Overflow).