Re: Can't upgrade my trial account.
Shadows of Angmar is basically the same content as what is contained in Free-To-Play game download which is why the key doesn't validate any more. It used to give you all of the quest packs with SoA pre-FTP *with a paid sub*. If you get a paid sub with your free download now, you still get all of SoA content for free - it just requires you to unlock it if you are not paying a subscription.
The only thing that key might have given you would be special boxed set items that came with the Gold edition had it been a vaild key. I don't know if there was anything with that particular set though, so you probably didn't miss out on anything by returning it. As for it being a Codemasters key, it is possible that if you had contacted Turbine Account Support they might have honored it and added the items to your account if applicable. (Not 100% sure, but possible)
Mines of Moria content is not included in the initial free to play download except for the book quests. So if you had bought that upgrade box set you would have basically purchased the Mines of Moria quests and any account upgrades that came with it (level 50 - 60 content.) If you were not paying for the subscription, you would still have had to unlock the SoA quests with points to help you level from @ level 20 - 50. Once you purchase MoM, those level 50-60 quests are unlocked on your account whether you pay a sub or not.
Clear as mud, right? :S
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