There's a couple options, don't worry.

1) Use a VPN service set for EU. There are some free ones which aren't guaranteed to work, but the paid ones usually have a free trial so you shouldn't have to pay.
2) Buy from a 3rd party. I think GreenManGaming will sell you an EU version even if you're not in the EU. I'm sure there are others as well.
3) Get a friend from the EU to buy it for you and give you the registration codes.