Hi,
There maybe some option depending on the current software you are running and the version you are trying to go to. Most of the time, the issue with this type of feature is that you can only go from one minor release to another and not so much from one major release to another. The other issue with stacking is that if you just reboot one of the switches after installing a new version, when that switch reboots, it comes back with a different IOS than the rest of the stack and that can cause the whole stack to malfunction. My advice is to do this type of work in a maintenance window and reboot the whole stack all at once if possible.
HTH
