Hi to all....heres what hapened...i have dcs 2.0, dcs open beta, on the same hdd and dcs 1.5.6 on another hdd.....i updated dcs 1.5.6 to the newer update the program searched files on the dcs open beta and updated dcs 1.5.6 and now the MIG 21 has activation problem and it doesnt runs.....i have bought the Mig 21 and i dont think the problem is the key....so what do you think is the problem?