To find the unique serial number of the WinMLS 2004 software you have installed, run WinMLS 2004 and you will find the serial number (PC-dependent). For a more detailed explanation see below. 

If you have not yet installed and run WinMLS, follow this procedure:

1.  the full version (no limitations) of WinMLS for FREE (~20 MB). You can use it for 30 days after you have registered here.
2. Install the software.
3. Run the software (Click the Start button, go to Programs->WinMLS 2004->WinMLS 2004).
4. Click the Try for FREE button.
5. In the next screen you will find the 8 digit serial number (PC-dependent).