I'm curious, why does one need to reinstall Jag? new installs once, but it's not something that exactly requires frequent reinstalls, at least in most cases...
Burning this disc is not going to be easy. I don't know, but it's possible that you have to run Jag before you can upgrade... sometimes the installers might try to modify files that a first run of Jag installs, or something... could be wrong about this.
Besides, .4 will be out very soon...
pnw