Thank you Richard 60. Those are all good points. I've duplicated my runtimes so as to have separate versions for P11 and P12 but these have have been on separate, external drives which have plenty of room unlike my drive C: (an ssd) which is getting on for three quarters full. I'm sure this isn't necessary but not only do I have a tendency to hoard ( I hate it when a change of windows means a program can't be run anymore) but also towards hypochondria (fear of crossover interference). (And who isn't at least slightly hypochondriacal (?) at present!) Thanks again and say safe! p.s. I know it's been chewed over many times but if DSON still worked in P11 that would be a very strong additional reason for keeping it. The material available in the DAZ store is mouthwatering. If only....