I'm going to upgrade my PC (XP +SP3) to NIS 2013. If not successful, I want to be able to go back to NIS 2012. I found some posts (e.g. NIS 2013 keys will not work on NIS 2012 installations, 10-07-2012 12:04 AM) on this forum that NIS 2013 keys do not work with NIS 2012, is this still the case? Does that mean once I'm using NIS 2013 there is no way back?