Android normally doesn’t allow you to install non-market apps. So you have to change your default settings to all the installation of install unsigned / non-market apps. You can do this quite easily though:
- Open the Settings app.
- Select Applications.
- Check the “Unknown sources” setting to allow the installation of non-market apps.
That’s it! Now simply navigate to the APK link via the browser on your Android device and you should be able to download and install the app.