I am about to retire a computer that has TI 9 running on it with a valid license. Can I purchase an upgrade and install it (TI 11) on my new computer? Will it work even though TI 9 is not installed on the new computer? In my prior experience with some other software upgrades, it was necessary for the old software to be detected on the new computer. I hope that won't be the case here. BTW, TI 9 worked flawlessly on my old computer running XP. I'm a little concerned about stability of TI 11 based on my readings on this message board. Are there any known issues relating to using TI 11 on an HP pavilion dv9500 notebook with vista sp1? I would be using TI 11 in a very basic mode - full backups to second internal HD - with no scheduling or other advanced features. Thanks.