have fun trying out 4.2 - note that the upgrade is designed to allow you to go back to 4.1 at any point, so installing 4.2 does not remove 4.1 and also the 4.2 settings start out as a copy of the 4.1 settings (after first use, the two sets evolve independently). This ensures that it is impossible to make settings adjustments in 4.2 that will then break 4.1, so if you have clear skies and 4.2 breaks you are always just a few seconds away from imaging with 4.1
cheers,
Robin