REINSTALLATION

hi guys,i bought the pmdg ngx,installed in my 2 pc,but i couldnt fly with good frames so i went today and bought a new pc,and now i cant install it.how can i delete the old activations so i can install in my new pc? i think its a bit confusing when u buy it,cause it doesnt say in anywhere how many activations do we have.i tried to look in everywhere with not answer.but to say that the money is not refundable they did in big red letters. dont think 2 activations are enought for the 60 euros i spend on it.i normally buy airplanes,but this is the less activation airplane i ever bought.probably from now and go on will use only craked versions of pmdg if i dont have an answer soon,