I have created a new rplib file for version 4.0.3 of Font Awesome. You can load this the same as the previous version just use the new URL locations for the proper version of the fonts and files.
Here is an updated version of the instructions:
1) Download and install Font Awesome 4.0.3
Open the "Font" folder and install the font.
2) Restart Axure
If Axure is open, shut it down completely and re-open it. This will allow you to choose FontAwesome from the font droplist.
3) Add Font Awesome CSS link to "Web Fonts" in the Generate Prototype dialog
4) Install the Axure Font Awesome widget library (attached below)
Alternatively, you can copy/paste icons from the FontAwesome official cheat sheet.
5) Drag and drop FontAwesome widgets from this library.
Adjust style of all icons using the "FontAwesome" custom style or format individual icons.
Note: Font Awesome icons are adjusted using font size and font color.
FontAwesomeV403.rplib (3.04 MB)