Dirac Live Active Room Treatment

Can I go back from the Measurement page to adjust master output (or individual speakers) and then continue measuring location points or does any adjustments on the Measurement Levels page require ALL measurements to be performed again?

It is perfectly safe to adjust either the master gain or the individual speaker gain (or both) in the Measurement Levels view of Dirac Live. The software will compensate for the adjustments made and you will not lose the previous measurements.