This is the most reliable way to find the serial number on an existing installation. Navigate to the following directory on your server: {cf_install_root}\cfusion\lib\ Open the license.properties file in a text editor like Notepad. The serial number is listed next to the sn= entry.
For the SERIAL_NUMBER field, remove all hyphens. Use 123456789012345678901234 . Serial number coldfusion 10
– The final update for CF10. Requires a valid serial. This is the most reliable way to find