Based on the description found on the majority of websites, the software is compatible only with these Android phone brands: Intex, Micromax, Lava, Karbonn, Spice and China smartphone. As you can see, these phones are somehow based in the eastern part of the world. I've seen SPD IMEI Changer on GSMForum as well which is targeted at those countries as well.
You don't need to be online as the process is done locally. A service shop in your area might provide additional information related to SPD IMEI Changer.