Keyclone is for life from everything I read. All the upgrades are included with your purchase of a license. For instance your brother's 1.8 can install a 1.9 (g is the recommended one right now I believe) over it with no problem. If you buy 2 1.9s for your own systems you can upgrade them to 2.0 when 2.0 comes out.

I am sure Rob (keyclone) will chime in when he sees the post but to stop ya from wondering figured I would chime in

YOu can go to the keyclone website and see the differences between the different versions. I think you can only download 1.9g and 1.9h right now (I use h with out any problems but it seems there are some issues for some people)