So to understand you had ninjatrader 8.0?what verssion more specific?but since you updated the windows this won’t work anymore?but now you have running ninjatrader 8.0.280 and you need full licence key?
Best guess is to go back to verssion 8.0.220 witch is fully cracked and freely sharred around…As for the version 8.0.280 you’re out of luck to find licence keys anywhere…