Went through screens to update, then presented with screen that needed to activate and given screen to enter Licence ID and Licence Password. Told Activation failed and presented with further screen:

Rebooted, tried again, same problem.
Completely uninstalled X1 (no preferences saved), rebooted, downloaded version of X1SearchSetup.exe mentioned here viewtopic.php?f=58&t=9361.
Tried installing again. Same problem occurring.
On other machine, no problem in upgrading. What is the next step?