The secret for me to get my SplashId Desktop version 6.0.1 to synchronize with my iPad was to turn the firewall OFF!

• Do NOT attempt to syncronize using Bluetooth.  It will NOT work.
• Plug in the serial cable between the iPad and the laptop USB port.
• Open SplashID Safe desktop on your computer.
• Open SplashID on your iPad.
• Turn off the laptop firewall. (Apple menu>System Preferences>Security>[unlock the padlock with your logon code]>press the Stop button.
• Confirm that the correct IP Address is written.  I found that 10.0.1.209 worked and 10.0.1.8 (desktop IP Address) also worked.
• Activate “Sync” button on the iPad screen bottom right.
• Wait for the synchronization to complete.
• Remember to turn ON the firewall when finished.