Step 1: Download it from : https://www.digitalsellz.com/p/MTMyODY
Step 2: If you're on a Mac, download Mono (it is free) : http://www.mono-project.com/docs/getting-started/install/mac/
Step 3: Extract the zip archive
Step 4: Run SX4U.exe
Step 5: Go to File -> Open
Step 6: Then choose the .exe of the game you want to extract the scripts from.
Step 7: Wait ... (the bigger the game, the longer it takes to decompile)
Step 8: When it's done you can see the scripts in the software and it will also tell you which folder it put the scripts in so that you can do whatever you want with them.
P.S. Read the Help file in the software to know how it works