Sounds to me like you need to contact them via their forum. Now this thread is locked.

When i pay 55$ for an addonn i dont expect the problems i have had, im not complaining about the bugs, they are to be expected in an advanced addon as the PMDG747 when released to us.What irritates me is the fact that i cant redownload it, just maybe in the first release mess something could have gone wrong with the download and caused the probs im experiencing, but i cant do that.Today i reinstalled my OS to see if that could have been the prob, just to find out that i now cant validate my 747 install because of to many tries, thanks alot PMDG you got my money now i can just sit and wait until somebody finds it suitable to reset my account.Now that just makes me angry, bugs i could have lived with until a patch was released, but that im not allowed to reinstall no matter how many times, and see if some of my other addons, software or hardware could have caused the probs is just too much.The PMDG team really needs to look at Flight1 too see how this is done in a proper way, with some respect for the costumers.Ah that was good to get that of my chest.OHN