Kelvin,

For your users to update, they just need to follow the directions on the Upgradez thread.

One difference between 1.0 and 2.0 I forgot to mention, is 2.0 includes Upgradez so all users can upgrade their Tuelz.

When they upgrade, their own info, as well as any of your rebranding, should remain, as this info isn't stored in the exe itself.