The latest version of Realmware's BF3 Settings Editor is 2.3. For your convenience, there are two download packages available for you to choose from.
Setup exe (recommended)
This executable file will install the program on your computer. It will add shortcuts to your Desktop and Start Menu, and you will be able to uninstall it later from the Control Panel in the usual way. It will also download the .NET Framework 4.0 Client Profile prerequisite for you if you do not already have it.
This is a .zip archive file which contains all the necessary files for the program. With this option, you will not need to install the program through a setup wizard; instead, you can just extract the files to whatever directory you like, and run the program from there. If you choose this option, you will need to make sure that you have the .NET Framework 4.0 Client Profile installed on your own.