For the refund, apparently in France, people asked for a refund on behalf of Microsoft which refused to them. I do not know what says the French and European law on the question.
Software falls in a big grey area as of now. At least, in the past, there was a physical medium so, even if the contents were still owned by the originator, it was possible to claim a refund on the basis that the medium had a defect that didn't allow fruition. (think of a book with a torn page or a CD coming off the factory with a scratch on the surface).
With an online distribution system, the medium is gone so, by paying a sum of money, you're just entering in a contract for licensing the content for personal use. You can argue that since the defect lies in the content itself, the distributor is essentially breaking the contract by not providing what the client was asking for. This has to be demostrated on a case by case basis so for a 20€ piece of software it's a waste of time and resources.
There are national exceptions, like the Right of Withdrawal, which the German Civil Law grants to all "customers who are also consumers" (so people buying for their own fruition of the service/content, not business activities). Using this law it would be possible to recede from the contract with the content provided under certain circumstances