I've upgraded to version 11, but every time it starts it says I have 15 days to go, and there's nowhere I can find to enter the new serial number. I've tried: installing over version 10; uninstalling and installing from scratch; uninstalling and deleting Acronis registry keys (although it still remembered my scheduled tasks) and then installing from scratch. All ways I get a message saying the installation was interrupted and that I need to restart the installer again. Everything seems to be working OK, but obviously in 15 days it's going to stop. How to I enter the serial number?