To stay legal, you should own a physical copy of the game and "dump" your own ISO file to use with these emulators. 2. The "Ultimate Mortal Kombat: Deception" Fan Project
is widely considered one of the pinnacle entries of the "3D era" of the franchise. However, finding a "PC download" for it can be tricky because it was never officially released for Windows . The original game launched in 2004 exclusively for PlayStation 2, Xbox, and GameCube.
You can also use xemu to play the original Xbox version.
The GameCube version is highly regarded because it included Shao Kahn and Goro as playable characters, which were absent from other console versions.