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You do not need to use the UK version at all and it will not invalidate your warranty. You can register your reader at the Sony UK website.
I have never downloaded the UK software and only use the US software. The advantage to doing this is that you get the sony freebies and access to the google epubs. The UK version just opens the Waterstones website which doesn't offer the freebies. You don't even need the sony software to buy books from Waterstones, just Adobe Digital Editions.
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