In the same folder where you have RegSupremePro.exe, create an empty file named DebugMode.dat. How? One way is first use the right click menu to create a new text file called DebugMode.txt, then rename it.
The next time you launch RSPro, a file called RSPro_debuglog.txt should appear on your desktop.
To turn off debug mode before you launch RSPro again, simply delete or rename DebugMode.dat.