1, There are currently region IP locks on the game. If you live in NA, you need to buy the NA version. If you live in the EU, buy the EU one. It is still unknown whether this will eventually open up, but right now you definitely should buy the version for your continent. (If you live in Australia or New Zealand, buy the NA version) And btw, Amazon.com sells only the NA version. Amazon.co.uk will sell you the EU version.
2, That depends entirely on the policy of the store you buy it from. Do some research on that shop before you order
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Mellonkitty