i have 2 computers. desktop and laptop. installed nitro on both after purchase but was also in the middle of various software tests and rebuilds. I dont know how many times in reinstalled windows 10/windowsw business etc over the past few weeks. i think i am done playing with my software but i need nitro to work again so i can work again. i really am not interested in going back to Acrobat DC Pro.   product serial number xxxxxxxxxx03913271  cleverbridge reference xxxx05551